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authorMagnus Henoch <[email protected]>2016-04-20 14:40:39 +0100
committerMagnus Henoch <[email protected]>2016-05-25 17:36:50 +0100
commit34f853950685e4e7ab38f30fc3f17a6beac13349 (patch)
tree7861f106dc4f1daa6cd2ac5e57e17e0410353b1e /erts
parent42a0229c44875f927bc1fda138d24131874a1c3c (diff)
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Add -start_epmd command line option
Add a command line option that lets you disable automatic starting of epmd when starting a distributed node. This differs from the undocumented setting -no_epmd, in that it does not affect the starting of an erl_epmd process within erl_distribution: the newly started node will expect an epmd instance to have been started previously.
Diffstat (limited to 'erts')
-rw-r--r--erts/doc/src/erl.xml18
-rw-r--r--erts/etc/common/erlexec.c21
2 files changed, 37 insertions, 2 deletions
diff --git a/erts/doc/src/erl.xml b/erts/doc/src/erl.xml
index 1bbde7f1e0..e63928ddb0 100644
--- a/erts/doc/src/erl.xml
+++ b/erts/doc/src/erl.xml
@@ -338,7 +338,8 @@
<seealso marker="kernel:net_kernel">net_kernel(3)</seealso>.
It is also ensured that <c><![CDATA[epmd]]></c> runs on the current host
before Erlang is started. See
- <seealso marker="epmd">epmd(1)</seealso>.</p>
+ <seealso marker="epmd">epmd(1)</seealso> and the
+ <seealso marker="#start_epmd"><c>-start_epmd</c></seealso> option.</p>
<p>The name of the node will be <c><![CDATA[Name@Host]]></c>, where
<c><![CDATA[Host]]></c> is the fully qualified host name of the current
host. For short names, use the <c><![CDATA[-sname]]></c> flag instead.</p>
@@ -463,6 +464,21 @@
flag and those running with the <c><![CDATA[-name]]></c> flag, as node
names must be unique in distributed Erlang systems.</p>
</item>
+ <tag><marker id="start_epmd"/><c>-start_epmd true | false</c></tag>
+ <item>
+
+ <p>Specifies whether Erlang should start
+ <seealso marker="epmd">epmd</seealso> on startup. By default
+ this is <c>true</c>, but if you prefer to start epmd
+ manually, set this to <c>false</c>.</p>
+
+ <p>This only applies if Erlang is started as a distributed node,
+ i.e. if <c>-name</c> or <c>-sname</c> is specified. Otherwise,
+ epmd is not started even if <c>-start_epmd true</c> is given.</p>
+
+ <p>Note that a distributed node will fail to start if epmd is
+ not running.</p>
+ </item>
<tag><marker id="smp"/><c><![CDATA[-smp [enable|auto|disable]]]></c></tag>
<item>
<p><c>-smp enable</c> and <c>-smp</c> starts the Erlang runtime
diff --git a/erts/etc/common/erlexec.c b/erts/etc/common/erlexec.c
index 42da05b1f7..2b2e0e480a 100644
--- a/erts/etc/common/erlexec.c
+++ b/erts/etc/common/erlexec.c
@@ -195,6 +195,7 @@ static char *plusz_val_switches[] = {
#endif
void usage(const char *switchname);
+static void usage_format(char *format, ...);
void start_epmd(char *epmd);
void error(char* format, ...);
@@ -795,6 +796,24 @@ int main(int argc, char **argv)
get_start_erl_data((char *) NULL);
}
#endif
+ else if (strcmp(argv[i], "-start_epmd") == 0) {
+ if (i+1 >= argc)
+ usage("-start_epmd");
+
+ if (strcmp(argv[i+1], "true") == 0) {
+ /* The default */
+ no_epmd = 0;
+ }
+ else if (strcmp(argv[i+1], "false") == 0) {
+ no_epmd = 1;
+ }
+ else
+ usage_format("Expected boolean argument for \'-start_epmd\'.\n");
+
+ add_arg(argv[i]);
+ add_arg(argv[i+1]);
+ i++;
+ }
else
add_arg(argv[i]);
@@ -1173,7 +1192,7 @@ usage_aux(void)
"]"
#endif
"] "
- "[-make] [-man [manopts] MANPAGE] [-x] [-emu_args] "
+ "[-make] [-man [manopts] MANPAGE] [-x] [-emu_args] [-start_epmd BOOLEAN] "
"[-args_file FILENAME] [+A THREADS] [+a SIZE] [+B[c|d|i]] [+c [BOOLEAN]] "
"[+C MODE] [+h HEAP_SIZE_OPTION] [+K BOOLEAN] "
"[+l] [+M<SUBSWITCH> <ARGUMENT>] [+P MAX_PROCS] [+Q MAX_PORTS] "