diff options
Diffstat (limited to 'system')
| -rw-r--r-- | system/doc/design_principles/applications.xml | 7 | ||||
| -rw-r--r-- | system/doc/design_principles/release_handling.xml | 17 | ||||
| -rw-r--r-- | system/doc/installation_guide/Makefile | 8 | ||||
| -rw-r--r-- | system/doc/installation_guide/install-binary.xml | 127 | ||||
| -rw-r--r-- | system/doc/installation_guide/part.xml | 4 | ||||
| -rw-r--r-- | system/doc/installation_guide/verification.xml | 102 | ||||
| -rw-r--r-- | system/doc/installation_guide/xmlfiles.mk | 6 | ||||
| -rw-r--r-- | system/doc/system_principles/create_target.xmlsrc | 248 | ||||
| -rw-r--r-- | system/doc/system_principles/part.xml | 4 | ||||
| -rw-r--r-- | system/doc/system_principles/system_principles.xml | 9 | ||||
| -rw-r--r-- | system/doc/system_principles/upgrade.xml | 118 | ||||
| -rw-r--r-- | system/doc/system_principles/xmlfiles.mk | 3 |
12 files changed, 399 insertions, 254 deletions
diff --git a/system/doc/design_principles/applications.xml b/system/doc/design_principles/applications.xml index 228ca1f2bf..7b030115df 100644 --- a/system/doc/design_principles/applications.xml +++ b/system/doc/design_principles/applications.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>1997</year><year>2013</year> + <year>1997</year><year>2014</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -157,8 +157,9 @@ ch_app:stop([])</code> all applications have dependencies to at least <c>kernel</c> and <c>stdlib</c>.</item> </taglist> - <p>The syntax and contents of of the application resource file - are described in detail in <c>app(4)</c>.</p> + <note><p>The syntax and contents of of the application resource file + are described in detail in the<seealso marker="kernel:app"> + Application resource file reference</seealso>.</p></note> </section> <section> diff --git a/system/doc/design_principles/release_handling.xml b/system/doc/design_principles/release_handling.xml index 2a5831b89f..ba8a88d1c2 100644 --- a/system/doc/design_principles/release_handling.xml +++ b/system/doc/design_principles/release_handling.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2003</year><year>2013</year> + <year>2003</year><year>2014</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -329,13 +329,26 @@ automatically ensured.</p> <p>When the release handler encounters the instruction, it first generates a temporary boot file, which starts the new versions - of the emulator and the core applications. Then it shuts down + of the emulator and the core applications, and the old version + of all other applications. Then it shuts down the current emulator by calling <c>init:reboot()</c>, see <c>init(3)</c>. All processes are terminated gracefully and the system is rebooted by the heart program, using the temporary boot file. After the reboot, the rest of the relup instructions are executed. This is done as a part of the temporary boot script.</p> + <warning> + <p>Since this mechanism causes the new versions of the + emulator and core applications to run with the old version of + other applications during startup, extra care must be taken to + avoid incompatibility. Incompatible changes in the core + applications may in some situations be necessary. If possible, + such changes are preceded by deprecation over two major + releases before the actual change. To make sure your + application is not crashed by an incompatible change, always + remove any call to deprecated functions as soon as + possible.</p> + </warning> <p>An info report is written when the upgrade is completed. To programatically find out if the upgrade is complete, call <c>release_handler:which_releases(current)</c> and check diff --git a/system/doc/installation_guide/Makefile b/system/doc/installation_guide/Makefile index 6923f52d8a..83210bd21f 100644 --- a/system/doc/installation_guide/Makefile +++ b/system/doc/installation_guide/Makefile @@ -1,7 +1,7 @@ # # %CopyrightBegin% # -# Copyright Ericsson AB 1996-2012. All Rights Reserved. +# Copyright Ericsson AB 1996-2014. All Rights Reserved. # # The contents of this file are subject to the Erlang Public License, # Version 1.1, (the "License"); you may not use this file except in @@ -58,8 +58,7 @@ XML_FILES = \ GENERATED_XML_FILES = \ INSTALL.xml \ INSTALL-CROSS.xml \ - INSTALL-WIN32.xml \ - MARKDOWN.xml + INSTALL-WIN32.xml # ---------------------------------------------------- @@ -74,8 +73,7 @@ REDIRECT_HTML_DIR = $(HTMLDIR)/source REDIRECT_HTML_FILES = \ $(REDIRECT_HTML_DIR)/INSTALL.html \ $(REDIRECT_HTML_DIR)/INSTALL-CROSS.html \ - $(REDIRECT_HTML_DIR)/INSTALL-WIN32.html \ - $(REDIRECT_HTML_DIR)/MARKDOWN.html + $(REDIRECT_HTML_DIR)/INSTALL-WIN32.html # ---------------------------------------------------- # FLAGS diff --git a/system/doc/installation_guide/install-binary.xml b/system/doc/installation_guide/install-binary.xml index 07027a39f6..af7dab6e44 100644 --- a/system/doc/installation_guide/install-binary.xml +++ b/system/doc/installation_guide/install-binary.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2000</year><year>2013</year> + <year>2000</year><year>2014</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -31,117 +31,40 @@ <rev>C</rev> <file>install-binary.xml</file> </header> - - <section> - <title>UNIX</title> - - <section> - <title>Introduction</title> - <p>The system is delivered as a single compressed tar file.</p> - <p>To browse the on-line HTML documentation, Netscape or an equivalent - browser supporting frames is needed.</p> - </section> - - <section> - <title>Installation Procedure</title> - <p>When installed, the entire system, except for a small start-up - script, resides in a single directory tree. The location of this - directory tree can be chosen arbitrarily by the installer, and it - does not need to be in the user's <c>$PATH</c>. The only requirements - are that the file system where it is placed has enough free space, - and that the users who run Erlang/OTP have read access to it. In the - example below, the directory tree is assumed to be located at - <c>/usr/local/erlang</c>, which is here called the <em>top-level directory</em>.</p> - <p>It is assumed that you have the compressed tar file, the name of - which is <c><![CDATA[<PREFIX>.tar.gz]]></c>, where <c><![CDATA[<PREFIX>]]></c> is a string - denoting the particular Erlang/OTP release, e.g. - <c>otp_LXA_11930_sunos5_R9B</c>.</p> - <p>Wherever the string <c><![CDATA[<PREFIX>]]></c> is used below, it should - be replaced by the actual name prefix of the compressed tar file.</p> - <p>The tape archive file does not have one single directory in which - all other files are rooted. Therefore the tape archive file must be - extracted into an empty (newly created) directory.</p> - <list type="ordered"> - <item> - <p>If the <em>top-level directory</em> does not already exist, - create it:</p> - <pre> -mkdir /usr/local/erlang</pre> - </item> - <item> - <p>Change the current directory to the <em>top level directory</em>:</p> - <pre> -cd /usr/local/erlang</pre> - </item> - <item> - <p>Create the <em>installation directory</em> with an appropriate - name. For example:</p> - <pre> -mkdir otp_r7b</pre> - </item> - <item> - <p>Change to the <em>installation directory</em>, e.g.</p> - <pre> -cd otp_r7b</pre> - </item> - <item> - <p>Assuming the compressed tar file resides in the directory - <c><![CDATA[<SOME-DIR>]]></c>,. extract the compressed tar file into the - current directory:</p> - <pre> -gunzip -c <SOME-DIR>/<PREFIX>.tar.gz | tar xfp -</pre> - </item> - <item> - <p>Read the <c>README</c> file in the installation directory for - last minute updates, before proceeding.</p> - </item> - <item> - <p>Run the <c>Install</c> script in the installation directory, - with the absolute path of the installation directory as argument,</p> - <pre> -./Install /usr/local/erlang/otp_r7b</pre> - <p>and supply answers to the prompts.</p> - <p>In most cases, there is a default answer in square brackets - (<c>[]</c>). If the default is satisfactory, just press - <c><![CDATA[<Return>]]></c>. In general you are only prompted for one thing:</p> - <list type="bulleted"> - <item> - <p>"Do you want to use a minimal system startup instead of the - SASL startup?" <br></br> - - In a minimal system, only the Kernel and STDLIB applications - are loaded and started. If the SASL startup is used, the SASL - application is included as well. Normally, the minimal system - is enough.</p> - </item> - </list> - </item> - <item> - <p>Make Erlang/OTP available for users, either by putting the path - <c>/usr/local/erlang/otp_r7b/bin</c> in users <c>$PATH</c> - variable, or link the executable - <c>/usr/local/erlang/otp_r7b/bin/erl</c> accordingly, e.g.:</p> - <pre> -ln -s /usr/local/erlang/otp_r7b/bin/erl /usr/local/bin/erl </pre> - </item> - </list> - </section> - </section> - <section> <title>Windows</title> <section> <title>Introduction</title> - <p>The system is delivered as a single <c>.exe</c> file.</p> - <p>To browse the on-line HTML documentation, Netscape or an equivalent - browser supporting frames is needed.</p> + <p>The system is delivered as a Windows Installer executable. + Get it from our <url href="http://www.erlang.org/download.html">download page</url>.</p> </section> <section> - <title>Installation Procedure</title> + <title>Installation</title> <p>The installation procedure is is automated. Double-click the <c>.exe</c> file icon and follow the instructions.</p> </section> + <section> + <title>Verification</title> + <list type="bulleted"> + <item> + <p>Start Erlang/OTP by double-clicking on the Erlang shortcut icon on the + desktop.</p> + <p>Expect a command line window to pop up with an output looking something like this:</p> + <pre> + Erlang/OTP 17 [erts-6.0] [64-bit] [smp:2:2] + + Eshell V6.0 (abort with ^G) + 1></pre> + </item> + <item> + <p>Exit by entering the command <c>halt()</c>,</p> + <pre> + 2> <input>halt().</input></pre> + <p>which will close the Erlang/OTP shell. </p> + </item> + </list> + </section> </section> </chapter> diff --git a/system/doc/installation_guide/part.xml b/system/doc/installation_guide/part.xml index 19808fd165..02bf98db7c 100644 --- a/system/doc/installation_guide/part.xml +++ b/system/doc/installation_guide/part.xml @@ -4,7 +4,7 @@ <part xmlns:xi="http://www.w3.org/2001/XInclude"> <header> <copyright> - <year>2000</year><year>2013</year> + <year>2000</year><year>2014</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -32,9 +32,7 @@ <p>How to install Erlang/OTP on UNIX or Windows.</p> </description> <xi:include href="install-binary.xml"/> - <xi:include href="verification.xml"/> <xi:include href="INSTALL.xml"/> <xi:include href="INSTALL-CROSS.xml"/> <xi:include href="INSTALL-WIN32.xml"/> - <xi:include href="MARKDOWN.xml"/> </part>
\ No newline at end of file diff --git a/system/doc/installation_guide/verification.xml b/system/doc/installation_guide/verification.xml deleted file mode 100644 index 391ddfb7b8..0000000000 --- a/system/doc/installation_guide/verification.xml +++ /dev/null @@ -1,102 +0,0 @@ -<?xml version="1.0" encoding="utf-8" ?> -<!DOCTYPE chapter SYSTEM "chapter.dtd"> - -<chapter> - <header> - <copyright> - <year>2000</year><year>2013</year> - <holder>Ericsson AB. All Rights Reserved.</holder> - </copyright> - <legalnotice> - The contents of this file are subject to the Erlang Public License, - Version 1.1, (the "License"); you may not use this file except in - compliance with the License. You should have received a copy of the - Erlang Public License along with this software. If not, it can be - retrieved online at http://www.erlang.org/. - - Software distributed under the License is distributed on an "AS IS" - basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See - the License for the specific language governing rights and limitations - under the License. - - </legalnotice> - - <title>Installation Verification</title> - <prepared>Peter Högfeldt</prepared> - <responsible>Peter Högfeldt</responsible> - <docno></docno> - <approved>(Peter Högfeldt</approved> - <checked></checked> - <date>1997-05-26</date> - <rev>C</rev> - <file>verification.xml</file> - </header> - <p>This chapter is about verifying your installation by performing - a few simple tests to see that your system is properly installed.</p> - - <section> - <title>UNIX</title> - <list type="bulleted"> - <item> - <p>Start Erlang/OTP from the command line,</p> - <pre> - unix> erl</pre> - <p>Expect the following output:</p> - <pre> - Erlang (BEAM) emulator version 5.0.1 [threads] - - Eshell V5.0.1 (abort with ^G) - 1></pre> - </item> - <item> - <p>Start the GS-based toolbar from the Erlang shell, </p> - <pre> - 1> <input>toolbar:start().</input></pre> - <p>and check that the toolbar window pops up. - </p> - <p><em>Note:</em> The trailing full stop (<c>"."</c>) is an end marker - for all commands in the Erlang shell, and must be entered for a - command to begin execution.</p> - </item> - <item> - <p>Exit by entering the command <c>halt()</c>,</p> - <pre> - 2> <input>halt().</input></pre> - <p>which should end both the toolbar window and the command line window. </p> - </item> - </list> - </section> - - <section> - <title>Windows</title> - <list type="bulleted"> - <item> - <p>Start Erlang/OTP by double-clicking on the Erlang shortcut icon on the - desktop.</p> - <p>Expect a command line window to pop up with the following output,</p> - <pre> - Erlang (BEAM) emulator version 5.0.1 [threads] - - Eshell V5.0.1 (abort with ^G) - 1></pre> - </item> - <item> - <p>Start the GS-based toolbar from the Erlang shell, </p> - <pre> - 1> <input>toolbar:start().</input></pre> - <p>and check that the toolbar window pops up. - </p> - <p><em>Note:</em> The trailing full stop (<c>"."</c>) is an end marker - for all commands in the Erlang shell, and must be entered for a - command to begin execution.</p> - </item> - <item> - <p>Exit by entering the command <c>halt()</c>,</p> - <pre> - 2> <input>halt().</input></pre> - <p>which should end both the toolbar window and the command line window. </p> - </item> - </list> - </section> -</chapter> - diff --git a/system/doc/installation_guide/xmlfiles.mk b/system/doc/installation_guide/xmlfiles.mk index 3995c607af..c443334cd7 100644 --- a/system/doc/installation_guide/xmlfiles.mk +++ b/system/doc/installation_guide/xmlfiles.mk @@ -1,7 +1,7 @@ # # %CopyrightBegin% # -# Copyright Ericsson AB 2009-2013. All Rights Reserved. +# Copyright Ericsson AB 2009-2014. All Rights Reserved. # # The contents of this file are subject to the Erlang Public License, # Version 1.1, (the "License"); you may not use this file except in @@ -18,8 +18,6 @@ # INST_GUIDE_CHAPTER_FILES = \ install-binary.xml \ - verification.xml \ INSTALL.xml \ INSTALL-CROSS.xml \ - INSTALL-WIN32.xml \ - MARKDOWN.xml + INSTALL-WIN32.xml diff --git a/system/doc/system_principles/create_target.xmlsrc b/system/doc/system_principles/create_target.xmlsrc index fbc935d708..b5f8d8ac4d 100644 --- a/system/doc/system_principles/create_target.xmlsrc +++ b/system/doc/system_principles/create_target.xmlsrc @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>2002</year><year>2013</year> + <year>2002</year><year>2014</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -21,7 +21,7 @@ </legalnotice> - <title>Creating a First Target System</title> + <title>Creating and Upgrading a Target System</title> <prepared>Peter Högfeldt</prepared> <responsible></responsible> <docno></docno> @@ -71,23 +71,24 @@ </section> <section> + <marker id="create"/> <title>Creating a Target System</title> <p>It is assumed that you have a working Erlang/OTP system structured according to the OTP Design Principles.</p> - <p><em>Step 1.</em> First create a <c>.rel</c> file (see - <c>rel(4)</c>) that specifies the <c>erts</c> version - and lists all applications that should be included in the new - basic target system. An example is the following + <p><em>Step 1.</em> First create a <c>.rel</c> file (see <seealso + marker="sasl:rel">rel(4)</seealso>) that specifies the <c>erts</c> + version and lists all applications that should be included in the + new basic target system. An example is the following <c>mysystem.rel</c> file:</p> <code type="none"> %% mysystem.rel {release, {"MYSYSTEM", "FIRST"}, - {erts, "5.1"}, - [{kernel, "2.7"}, - {stdlib, "1.10"}, - {sasl, "1.9.3"}, - {pea, "1.0"}]}. </code> + {erts, "5.10.4"}, + [{kernel, "2.16.4"}, + {stdlib, "1.19.4"}, + {sasl, "2.3.4"}, + {pea, "1.0"}]}.</code> <p>The listed applications are not only original Erlang/OTP applications but possibly also new applications that you have written yourself (here examplified by the application @@ -116,13 +117,13 @@ os> <input>erl -pa /home/user/target_system/myapps/pea-1.0/ebin</input></pre> <c>systools:make_tar/2</c>. That file has the following contents:</p> <code type="none"> -erts-5.1/bin/ +erts-5.10.4/bin/ releases/FIRST/start.boot releases/FIRST/mysystem.rel releases/mysystem.rel -lib/kernel-2.7/ -lib/stdlib-1.10/ -lib/sasl-1.9.3/ +lib/kernel-2.16.4/ +lib/stdlib-1.19.4/ +lib/sasl-2.3.4/ lib/pea-1.0/ </code> <p>The file <c>releases/FIRST/start.boot</c> is a copy of our <c>mysystem.boot</c></p> @@ -142,16 +143,19 @@ lib/pea-1.0/ </code> <item>Creates the temporary directory <c>tmp</c> and extracts the tar file <c>mysystem.tar.gz</c> into that directory. </item> <item>Deletes the <c>erl</c> and <c>start</c> files from - <c>tmp/erts-5.1/bin</c>. These files will be created again from + <c>tmp/erts-5.10.4/bin</c>. These files will be created again from source when installing the release.</item> <item>Creates the directory <c>tmp/bin</c>.</item> <item>Copies the previously created file <c>plain.boot</c> to <c>tmp/bin/start.boot</c>.</item> <item>Copies the files <c>epmd</c>, <c>run_erl</c>, and - <c>to_erl</c> from the directory <c>tmp/erts-5.1/bin</c> to + <c>to_erl</c> from the directory <c>tmp/erts-5.10.4/bin</c> to the directory <c>tmp/bin</c>.</item> + <item>Creates the directory <c>tmp/log</c>, which will be used + if the system is started as embedded with the <c>bin/start</c> + script.</item> <item>Creates the file <c>tmp/releases/start_erl.data</c> with - the contents "5.1 FIRST". This file is to be passed as data + the contents "5.10.4 FIRST". This file is to be passed as data file to the <c>start_erl</c> script. </item> <item>Recreates the file <c>mysystem.tar.gz</c> from the directories @@ -171,11 +175,11 @@ lib/pea-1.0/ </code> <item>Extracts the tar file <c>mysystem.tar.gz</c> into the target directory <c>/usr/local/erl-target</c>.</item> <item>In the target directory reads the file <c>releases/start_erl.data</c> - in order to find the Erlang runtime system version ("5.1").</item> + in order to find the Erlang runtime system version ("5.10.4").</item> <item>Substitutes <c>%FINAL_ROOTDIR%</c> and <c>%EMU%</c> for <c>/usr/local/erl-target</c> and <c>beam</c>, respectively, in the files <c>erl.src</c>, <c>start.src</c>, and - <c>start_erl.src</c> of the target <c>erts-5.1/bin</c> + <c>start_erl.src</c> of the target <c>erts-5.10.4/bin</c> directory, and puts the resulting files <c>erl</c>, <c>start</c>, and <c>run_erl</c> in the target <c>bin</c> directory.</item> @@ -185,6 +189,7 @@ lib/pea-1.0/ </code> </section> <section> + <marker id="start"/> <title>Starting a Target System</title> <p>Now we have a target system that can be started in various ways.</p> <p>We start it as a <em>basic target system</em> by invoking</p> @@ -193,7 +198,7 @@ os> <input>/usr/local/erl-target/bin/erl</input></pre> <p>where only the <c>kernel</c> and <c>stdlib</c> applications are started, i.e. the system is started as an ordinary development system. There are only two files needed for all this to work: - <c>bin/erl</c> file (obtained from <c>erts-5.1/bin/erl.src</c>) + <c>bin/erl</c> file (obtained from <c>erts-5.10.4/bin/erl.src</c>) and the <c>bin/start.boot</c> file (a copy of <c>plain.boot</c>).</p> <p>We can also start a distributed system (requires <c>bin/epmd</c>).</p> <p>To start all applications specified in the original @@ -208,9 +213,10 @@ os> <input>/usr/local/erl-target/bin/erl -boot /usr/local/erl-target/releases/FI <c>bin/run_erl</c>, which in turn calls <c>bin/start_erl</c> (roughly, <c>start_erl</c> is an embedded variant of <c>erl</c>). </p> - <p>The shell script <c>start</c> is only an example. You should - edit it to suite your needs. Typically it is executed when the - UNIX system boots.</p> + <p>The shell script <c>start</c>, which is generated from + erts-5.10.4/bin/start.src during installation, is only an + example. You should edit it to suite your needs. Typically it is + executed when the UNIX system boots.</p> <p><c>run_erl</c> is a wrapper that provides logging of output from the run-time system to file. It also provides a simple mechanism for attaching to the Erlang shell (<c>to_erl</c>).</p> @@ -218,7 +224,7 @@ os> <input>/usr/local/erl-target/bin/erl -boot /usr/local/erl-target/releases/FI (<c>"/usr/local/erl-target"</c>), the releases directory (<c>"/usr/local/erl-target/releases"</c>), and the location of the <c>start_erl.data</c> file. It reads the run-time system - version (<c>"5.1"</c>) and release version (<c>"FIRST"</c>) from + version (<c>"5.10.4"</c>) and release version (<c>"FIRST"</c>) from the <c>start_erl.data</c> file, starts the run-time system of the version found, and provides <c>-boot</c> flag specifying the boot file of the release version found @@ -258,6 +264,198 @@ os> <input>/usr/local/erl-target/bin/erl -boot /usr/local/erl-target/releases/FI </section> <section> + <title>Creating the Next Version</title> + + <p> + In this example the <c>pea</c> application has been changed, and + so are <c>erts</c>, <c>kernel</c>, <c>stdlib</c> and + <c>sasl</c>. + </p> + + <p> + <em>Step 1.</em> Create the <c>.rel</c> file: + </p> + <code type="none"> +%% mysystem2.rel +{release, + {"MYSYSTEM", "SECOND"}, + {erts, "6.0"}, + [{kernel, "3.0"}, + {stdlib, "2.0"}, + {sasl, "2.4"}, + {pea, "2.0"}]}.</code> + <p> + <em>Step 2.</em> Create the application upgrade file (see + <seealso marker="sasl:appup">appup(4)</seealso>) for <c>pea</c>, + for example: + </p> + <code type="none"> +%% pea.appup +{"2.0", + [{"1.0",[{load_module,pea_lib}]}], + [{"1.0",[{load_module,pea_lib}]}]}.</code> + <p> + <em>Step 3.</em> From the directory where the + <c>mysystem2.rel</c> file reside, start the Erlang/OTP system: + </p> + <pre> +os> <input>erl -pa /home/user/target_system/myapps/pea-2.0/ebin</input></pre> + <p>giving the path to the new version of <c>pea</c>. </p> + + <p> + <em>Step 4.</em> Create the release upgrade file (see <seealso + marker="sasl:relup">relup(4)</seealso>): + </p> + <pre> +1> <input>systools:make_relup("mysystem2",["mysystem"],["mysystem"],[{path,["/home/user/target_system/myapps/pea-1.0/ebin","/my/old/erlang/lib/*/ebin"]}]).</input></pre> + <p> + where <c>"mysystem"</c> is the base release and + <c>"mysystem2"</c> is the release to upgrade to. + </p> + <p> + Note that the <c>path</c> option is used for pointing out the + old version of all applications. (The new versions are already + in the code path - assuming of course that the erlang node on + which this is executed is running the correct version of + Erlang/OTP.) + </p> + <p> + <em>Step 5.</em> Create the new release: + </p> + <pre> +2> <input>target_system:create("mysystem2").</input></pre> + <p> + Given that the <c>relup</c> file generated in step 4 above is + now located in the current directory, it will automatically be + included in the release package. + </p> + </section> + + <section> + <title>Upgrading the Target System</title> + <p> + This part is done on the target node, and for this example we + want the node to be running as an embedded system with the + <c>-heart</c> option, allowing automatic restart of the + node. See <seealso marker="#start">Starting a Target + System</seealso> above for more information. + </p> + <p> + We add <c>-heart</c> to <c>bin/start</c>: + </p> + <code type="none"> +#!/bin/sh +ROOTDIR=/usr/local/erl-target/ + +if [ -z "$RELDIR" ] +then + RELDIR=$ROOTDIR/releases +fi + +START_ERL_DATA=${1:-$RELDIR/start_erl.data} + +$ROOTDIR/bin/run_erl -daemon /tmp/ $ROOTDIR/log "exec $ROOTDIR/bin/start_erl $ROOTDIR $RELDIR $START_ERL_DATA -heart</code> + <p> + And we use the simplest possible <c>sys.config</c>, which we + store in <c>releases/FIRST</c>: + </p> + <code type="none"> +%% sys.config +[].</code> + <p> + Finally, in order to prepare the upgrade, we need to put the new + release package in the <c>releases</c> directory of the first + target system: + </p> + <pre> +os> <input>cp mysystem2.tar.gz /usr/local/erl-target/releases</input></pre> + <p> + And assuming that the node has been started like this: + </p> + <pre> +os> <input>/usr/local/erl-target/bin/start</input></pre> + <p> + it can be accessed like this: + </p> + <pre> +os> <input>/usr/local/erl-target/bin/to_erl /tmp/erlang.pipe.1</input></pre> + <p> + Also note that logs can be found in + <c>/usr/local/erl-target/log</c>. This directory is specified as + an argument to <c>run_erl</c>in the start script listed above. + </p> + <p> + <em>Step 1.</em> Unpack the release: + </p> + <pre> +1> <input>{ok,Vsn} = release_handler:unpack_release("mysystem2").</input></pre> + <p> + <em>Step 2.</em> Install the release: + </p> + <pre> +2> <input>release_handler:install_release(Vsn).</input> +<output>{continue_after_restart,"FIRST",[]} +heart: Tue Apr 1 12:15:10 2014: Erlang has closed. +heart: Tue Apr 1 12:15:11 2014: Executed "/usr/local/erl-target/bin/start /usr/local/erl-target/releases/new_start_erl.data" -> 0. Terminating. +[End]</output></pre> + <p> + The above return value and output after the call to + <c>release_handler:install_release/1</c> means that the + <c>release_handler</c> has restarted the node by using + <c>heart</c>. This will always be done when the upgrade involves + a change of <c>erts</c>, <c>kernel</c>, <c>stdlib</c> or + <c>sasl</c>. See <seealso marker="upgrade">Upgrade when + Erlang/OTP has Changed</seealso> for more infomation about this. + </p> + <p> + The node will be accessable via a new pipe: + </p> + <pre> +os> <input>/usr/local/erl-target/bin/to_erl /tmp/erlang.pipe.2</input></pre> + <p> + Let's see which releases we have in our system: + </p> + <pre> +1> <input>release_handler:which_releases().</input> +<output>[{"MYSYSTEM","SECOND", + ["kernel-3.0","stdlib-2.0","sasl-2.4","pea-2.0"], + current}, + {"MYSYSTEM","FIRST", + ["kernel-2.16.4","stdlib-1.19.4","sasl-2.3.4","pea-1.0"], + permanent}]</output></pre> + <p> + Our new release, "SECOND", is now the current release, but we + can also see that our "FIRST" release is still permanent. This + means that if the node would be restarted at this point, it + would come up running the "FIRST" release again. + </p> + <p> + <em>Step 3.</em> Make the new release permanent: + </p> + <pre> +2> <input>release_handler:make_permanent("SECOND").</input></pre> + + <p> + Now look at the releases again: + </p> + + <pre> +3> <input>release_handler:which_releases().</input> +<output>[{"MYSYSTEM","SECOND", + ["kernel-3.0","stdlib-2.0","sasl-2.4","pea-2.0"], + permanent}, + {"MYSYSTEM","FIRST", + ["kernel-2.16.4","stdlib-1.19.4","sasl-2.3.4","pea-1.0"], + old}]</output></pre> + + <p> + Here we see that the new release version is <c>permanent</c>, so + it would be safe to restart the node. + </p> + + </section> + + <section> <title>Listing of target_system.erl</title> <p>This module can also be found in the <c>examples</c> directory of the <c>sasl</c> application.</p> diff --git a/system/doc/system_principles/part.xml b/system/doc/system_principles/part.xml index 811428baae..d05c89fde8 100644 --- a/system/doc/system_principles/part.xml +++ b/system/doc/system_principles/part.xml @@ -4,7 +4,7 @@ <part xmlns:xi="http://www.w3.org/2001/XInclude"> <header> <copyright> - <year>1997</year><year>2013</year> + <year>1997</year><year>2014</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -31,6 +31,6 @@ <xi:include href="system_principles.xml"/> <xi:include href="error_logging.xml"/> <xi:include href="create_target.xml"/> + <xi:include href="upgrade.xml"/> <xi:include href="versions.xml"/> </part> - diff --git a/system/doc/system_principles/system_principles.xml b/system/doc/system_principles/system_principles.xml index 4f2202fdd1..70c69b1dab 100644 --- a/system/doc/system_principles/system_principles.xml +++ b/system/doc/system_principles/system_principles.xml @@ -4,7 +4,7 @@ <chapter> <header> <copyright> - <year>1996</year><year>2013</year> + <year>1996</year><year>2014</year> <holder>Ericsson AB. All Rights Reserved.</holder> </copyright> <legalnotice> @@ -34,13 +34,12 @@ <p>An Erlang runtime system is started with the command <c>erl</c>:</p> <pre> % <input>erl</input> -Erlang (BEAM) emulator version 5.2.3.5 [hipe] [threads:0] +Erlang/OTP 17 [erts-6.0] [hipe] [smp:8:8] -Eshell V5.2.3.5 (abort with ^G) +Eshell V6.0 (abort with ^G) 1> </pre> <p><c>erl</c> understands a number of command line arguments, see - <c>erl(1)</c>. A number of them are also described in this - chapter.</p> + <c>erl(1)</c>. A number of them are also described in this chapter.</p> <p>Application programs can access the values of the command line arguments by calling one of the functions <c>init:get_argument(Key)</c>, or <c>init:get_arguments()</c>. diff --git a/system/doc/system_principles/upgrade.xml b/system/doc/system_principles/upgrade.xml new file mode 100644 index 0000000000..68e48da0b8 --- /dev/null +++ b/system/doc/system_principles/upgrade.xml @@ -0,0 +1,118 @@ +<?xml version="1.0" encoding="utf-8" ?> +<!DOCTYPE chapter SYSTEM "chapter.dtd"> + +<chapter> + <header> + <copyright> + <year>2014</year> + <holder>Ericsson AB. All Rights Reserved.</holder> + </copyright> + <legalnotice> + The contents of this file are subject to the Erlang Public License, + Version 1.1, (the "License"); you may not use this file except in + compliance with the License. You should have received a copy of the + Erlang Public License along with this software. If not, it can be + retrieved online at http://www.erlang.org/. + + Software distributed under the License is distributed on an "AS IS" + basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See + the License for the specific language governing rights and limitations + under the License. + + </legalnotice> + + <title>Upgrade when Erlang/OTP has Changed</title> + <prepared></prepared> + <responsible></responsible> + <docno></docno> + <approved></approved> + <checked></checked> + <date>2014-02-19</date> + <rev></rev> + <file>upgrade.xml</file> + </header> + + <section> + <title>Introduction</title> + <p> + As of Erlang/OTP 17, most applications deliver a valid + application upgrade (<c>appup</c>) file. In earlier releases, a + majority of the applications in Erlang/OTP did not support + upgrade at all. Many of the applications use the + <c>restart_application</c> instruction. These are applications + for which it is not crucial to support real soft upgrade, for + instance tools and library applications. The + <c>restart_application</c> instruction + ensures that all modules in the application are reloaded and + thereby running the new code. + </p> + </section> + + <section> + <title>Upgrade of core applications</title> + <p> + The core applications ERTS, Kernel, STDLIB + and SASL never allow real soft upgrade, but require the + Erlang emulator to be restarted. This is indicated to the + <c>release_handler</c> by the upgrade instruction + <c>restart_new_emulator</c>. This instruction will always be the + very first instruction executed, and it will restart the + emulator with the new versions of the above mentioned core + applications and the old versions of all other + applications. When the node is back up all other upgrade instructions are + executed, making sure each application is finally running its + new version. + </p> + + <p> + It might seem strange to do a two-step upgrade instead of + just restarting the emulator with the new version of all + applications. The reason for this design decision is to allow + <c>code_change</c> functions to have side effects, for example changing + data on disk. It also makes sure that the upgrade mechanism for + non-core applications does not differ depending on whether or not + core applications are changed at the same time. + </p> + + <p> + If, however, the more brutal variant is preferred, it is + possible to handwrite the release upgrade file using only the + single upgrade instruction <c>restart_emulator</c>. This + instruction, in contrast to <c>restart_new_emulator</c>, will + cause the emulator to restart with the new versions of + <em>all</em> applications. + </p> + + <p> + <em>Note</em> that if other instructions are included before + <c>restart_emulator</c> in the handwritten <c>relup</c> file, + they will be executed in the old emulator. This is a big risk + since there is no guarantee that new beam code can be loaded + into the old emulator. Adding instructions after + <c>restart_emulator</c> has no effect as the + <c>release_handler</c> will not do any attempt at executing + them. + </p> + + <p> + See <seealso marker="sasl:relup">relup(4)</seealso> for + information about the release upgrade file, and <seealso + marker="sasl:appup">appup(4)</seealso> for further information + about upgrade instructions. + </p> + </section> + + <section> + <title>Applications that still do not allow code upgrade</title> + <p> + A few applications, for instance HiPE do not support + upgrade at all. This is indicated by an application upgrade file + containing only <c>{Vsn,[],[]}</c>. Any attempt at creating a release + upgrade file with such input will fail. + The only way to force an upgrade involving applications like this is to + handwrite the <c>relup</c> file, preferably as described above + with only the <c>restart_emulator</c> instruction. + </p> + + </section> +</chapter> diff --git a/system/doc/system_principles/xmlfiles.mk b/system/doc/system_principles/xmlfiles.mk index 9743949798..c60ffbad28 100644 --- a/system/doc/system_principles/xmlfiles.mk +++ b/system/doc/system_principles/xmlfiles.mk @@ -1,7 +1,7 @@ # # %CopyrightBegin% # -# Copyright Ericsson AB 2009. All Rights Reserved. +# Copyright Ericsson AB 2009-2014. All Rights Reserved. # # The contents of this file are subject to the Erlang Public License, # Version 1.1, (the "License"); you may not use this file except in @@ -20,4 +20,5 @@ SYSTEM_PRINCIPLES_CHAPTER_FILES = \ system_principles.xml \ error_logging.xml \ create_target.xml \ + upgrade.xml \ versions.xml |