@@ -87,6 +87,12 @@
<dd>
Returns "true" if ovn-northd is currently paused, "false"
otherwise.
</dd>
+
+ <dt><code>is-active</code></dt>
+ <dd>
+ When ovn-northd is connected to clustered OVN DB servers, this
returns
+ "true" if ovn-northd is currently active, "false" otherwise.
+ </dd>
</dl>
</p>
@@ -130,6 +136,19 @@
DB changes.
</p>
+ <h2> Active-Standby with clustered OVN DB servers</h2>
+ <p>
+ When <code>ovn-northd</code> is connected to clustered OVN DB
servers a
+ OVSDB locking feature will be used to ensure only one
+ <code>ovn-northd</code> process is active at a time.
+ </p>
+
+ <p>
+ The <code>ovn-northd</code> daemon will write an entry in its log
when
+ it becomes active. You may query the active status at any time with
+ the <code>is-active</code> management command.
+ </p>
+
<h1>Logical Flow Table Structure</h1>
<p>
@@ -55,6 +55,7 @@ static unixctl_cb_func ovn_northd_exit;
static unixctl_cb_func ovn_northd_pause;
static unixctl_cb_func ovn_northd_resume;
static unixctl_cb_func ovn_northd_is_paused;
+static unixctl_cb_func ovn_northd_is_active;
struct northd_context {
struct ovsdb_idl *ovnnb_idl;
@@ -10425,6 +10426,7 @@ main(int argc, char *argv[])
int retval;
bool exiting;
bool paused;
+ bool had_lock;
fatal_ignore_sigpipe();
ovs_cmdl_proctitle_init(argc, argv);
@@ -10450,6 +10452,8 @@ main(int argc, char *argv[])
unixctl_command_register("resume", "", 0, 0, ovn_northd_resume,
&paused);
unixctl_command_register("is-paused", "", 0, 0, ovn_northd_is_paused,
&paused);
+ unixctl_command_register("is-active", "", 0, 0, ovn_northd_is_active,
+ &had_lock);
daemonize_complete();
When ovn-northd is connected to clustered OVN DB servers a OVSDB locking feature is used to ensure only one ovn-northd process is active at a time. This patch adds a `is-active` management command that allows the operator to query whether a ovn-northd process is currently active or not. At present this information is only available in the log. Signed-off-by: Frode Nordahl <frode.nordahl@canonical.com> --- northd/ovn-northd.8.xml | 19 +++++++++++++++++++ northd/ovn-northd.c | 18 +++++++++++++++++- 2 files changed, 36 insertions(+), 1 deletion(-) @@ -10636,11 +10640,11 @@ main(int argc, char *argv[]) * acquiring a lock called "ovn_northd" on the southbound database * and then only performing DB transactions if the lock is held. */ ovsdb_idl_set_lock(ovnsb_idl_loop.idl, "ovn_northd"); - bool had_lock = false; /* Main loop. */ exiting = false; paused = false; + had_lock = false; while (!exiting) { if (!paused) { struct northd_context ctx = { @@ -10748,3 +10752,15 @@ ovn_northd_is_paused(struct unixctl_conn *conn, int argc OVS_UNUSED, unixctl_command_reply(conn, "false"); } } + +static void +ovn_northd_is_active(struct unixctl_conn *conn, int argc OVS_UNUSED, + const char *argv[] OVS_UNUSED, void *had_lock_) +{ + bool *had_lock = had_lock_; + if (*had_lock) { + unixctl_command_reply(conn, "true"); + } else { + unixctl_command_reply(conn, "false"); + } +}