[ovs-dev] [PATCH 1/4] ovn: ovn-ctl support to start ovn db servers in backup mode

bschanmu at redhat.com bschanmu at redhat.com
Thu Sep 15 08:34:57 UTC 2016


This patch adds support to start_ovsdb() function in ovn-ctl to start the
ovn db servers in backup mode. This can be done in the following ways
1. Use parameters --ovn-nb-sync-from-addr and --ovn-sb-sync-from-addr to
   set the addresses of the active server.
2. Create files $etcdir/ovnnb-active.conf and $etcdir/ovnsb-active.conf
   with the tcp url of the active servers.

If --ovn-nb-sync-from-addr and --ovn-sb-sync-from-addr is used, it will
overwrite the contents in the $etcdir/*.conf and use that server as the
active server.

Additional functions to promote a backup server to active and demote
active server to backup mode are also added in this patch

start_northd is changed such that it tries to connect to the db server urls
in $etcdir/*.conf when the *.conf files exist, else it will connect to
the unix socket.

Signed-off-by: Babu Shanmugam <bschanmu at redhat.com>
---
 ovn/utilities/ovn-ctl | 119 +++++++++++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 118 insertions(+), 1 deletion(-)

diff --git a/ovn/utilities/ovn-ctl b/ovn/utilities/ovn-ctl
index 07bff8a..e62e095 100755
--- a/ovn/utilities/ovn-ctl
+++ b/ovn/utilities/ovn-ctl
@@ -26,6 +26,8 @@ for dir in "$sbindir" "$bindir" /sbin /bin /usr/sbin /usr/bin; do
 done
 
 
+ovnnb_active_conf_file="$etcdir/ovnnb-active.conf"
+ovnsb_active_conf_file="$etcdir/ovnsb-active.conf"
 ## ----- ##
 ## start ##
 ## ----- ##
@@ -45,6 +47,44 @@ stop_ovsdb () {
     fi
 }
 
+demote_ovnnb() {
+    if test ! -z "$DB_NB_SYNC_FROM_ADDR"; then
+        echo "tcp:$DB_NB_SYNC_FROM_ADDR:$DB_NB_SYNC_FROM_PORT" > $ovnnb_active_conf_file
+    fi
+
+    if test -e $ovnnb_active_conf_file; then
+        ovs-appctl -t $rundir/ovnnb_db.ctl ovsdb-server/set-active-ovsdb-server `cat $ovnnb_active_conf_file`
+        ovs-appctl -t $rundir/ovnnb_db.ctl ovsdb-server/connect-active-ovsdb-server
+    else
+        echo >&2 "$0: active server details not set"
+        exit 1
+    fi
+}
+
+demote_ovnsb() {
+    if test ! -z "$DB_SB_SYNC_FROM_ADDR"; then
+        echo "tcp:$DB_SB_SYNC_FROM_ADDR:$DB_SB_SYNC_FROM_PORT" > $ovnsb_active_conf_file
+    fi
+
+    if test -e $ovnsb_active_conf_file; then
+        ovs-appctl -t $rundir/ovnsb_db.ctl ovsdb-server/set-active-ovsdb-server `cat $ovnsb_active_conf_file`
+        ovs-appctl -t $rundir/ovnsb_db.ctl ovsdb-server/connect-active-ovsdb-server
+    else
+        echo >&2 "$0: active server details not set"
+        exit 1
+    fi
+}
+
+promote_ovnnb() {
+    rm -f $ovnnb_active_conf_file
+    ovs-appctl -t $rundir/ovnnb_db.ctl ovsdb-server/disconnect-active-ovsdb-server
+}
+
+promote_ovnsb() {
+    rm -f $ovnsb_active_conf_file
+    ovs-appctl -t $rundir/ovnsb_db.ctl ovsdb-server/disconnect-active-ovsdb-server
+}
+
 start_ovsdb () {
     # Check and eventually start ovsdb-server for Northbound DB
     if ! pidfile_is_running $DB_NB_PID; then
@@ -54,6 +94,14 @@ start_ovsdb () {
 
         set "$@" --detach --monitor $OVN_NB_LOG --log-file=$OVN_NB_LOGFILE --remote=punix:$DB_NB_SOCK --remote=ptcp:$DB_NB_PORT:$DB_NB_ADDR --pidfile=$DB_NB_PID --unixctl=ovnnb_db.ctl
 
+        if test ! -z "$DB_NB_SYNC_FROM_ADDR"; then
+            echo "tcp:$DB_NB_SYNC_FROM_ADDR:$DB_NB_SYNC_FROM_PORT" > $ovnnb_active_conf_file
+        fi
+
+        if test -e $ovnnb_active_conf_file; then
+            set "$@" --sync-from=`cat $ovnnb_active_conf_file`
+        fi
+
         $@ $DB_NB_FILE
     fi
 
@@ -64,10 +112,39 @@ start_ovsdb () {
         set ovsdb-server
 
         set "$@" --detach --monitor $OVN_SB_LOG --log-file=$OVN_SB_LOGFILE --remote=punix:$DB_SB_SOCK --remote=ptcp:$DB_SB_PORT:$DB_SB_ADDR --pidfile=$DB_SB_PID --unixctl=ovnsb_db.ctl
+
+        if test ! -z "$DB_SB_SYNC_FROM_ADDR"; then
+            echo "tcp:$DB_SB_SYNC_FROM_ADDR:$DB_SB_SYNC_FROM_PORT" > $ovnsb_active_conf_file
+        fi
+
+        if test -e $ovnsb_active_conf_file; then
+            set "$@" --sync-from=`cat $ovnsb_active_conf_file`
+        fi
+
         $@ $DB_SB_FILE
     fi
 }
 
+sync_status() {
+    ovs-appctl -t $rundir/ovn${1}_db.ctl ovsdb-server/sync-status | awk '{if(NR==1) print $2}'
+}
+
+status_ovnnb() {
+    if ! pidfile_is_running $DB_NB_PID; then
+        echo "not-running"
+    else
+        echo "running/$(sync_status nb)"
+    fi
+}
+
+status_ovnsb() {
+    if ! pidfile_is_running $DB_SB_PID; then
+        echo "not-running"
+    else
+        echo "running/$(sync_status sb)"
+    fi
+}
+
 status_ovsdb () {
   if ! pidfile_is_running $DB_NB_PID; then
       log_success_msg "OVN Northbound DB is not running"
@@ -103,7 +180,21 @@ start_northd () {
       if test X"$OVN_NORTHD_LOGFILE" != X; then
           set "$@" --log-file=$OVN_NORTHD_LOGFILE
       fi
-      set "$@" $OVN_NORTHD_LOG --ovnnb-db=unix:$DB_NB_SOCK --ovnsb-db=unix:$DB_SB_SOCK
+
+      set "$@" $OVN_NORTHD_LOG
+
+      if test -e $ovnnb_active_conf_file; then
+          set "$@" --ovnnb-db=`cat $ovnnb_active_conf_file`
+      else
+          set "$@" --ovnnb-db=unix:$DB_NB_SOCK
+      fi
+
+      if test -e $ovnsb_active_conf_file; then
+          set "$@" --ovnsb-db=`cat $ovnsb_active_conf_file`
+      else
+          set "$@" --ovnsb-db=unix:$DB_SB_SOCK
+      fi
+
       OVS_RUNDIR=${OVN_RUNDIR} start_daemon "$OVN_NORTHD_PRIORITY" "$OVN_NORTHD_WRAPPER" "$@"
   fi
 }
@@ -176,12 +267,16 @@ set_defaults () {
     DB_NB_FILE=$dbdir/ovnnb_db.db
     DB_NB_ADDR=0.0.0.0
     DB_NB_PORT=6641
+    DB_NB_SYNC_FROM_ADDR=
+    DB_NB_SYNC_FROM_PORT=6641
 
     DB_SB_SOCK=$rundir/ovnsb_db.sock
     DB_SB_PID=$rundir/ovnsb_db.pid
     DB_SB_FILE=$dbdir/ovnsb_db.db
     DB_SB_ADDR=0.0.0.0
     DB_SB_PORT=6642
+    DB_SB_SYNC_FROM_ADDR=
+    DB_SB_SYNC_FROM_PORT=6642
 
     DB_NB_SCHEMA=$datadir/ovn-nb.ovsschema
     DB_SB_SCHEMA=$datadir/ovn-sb.ovsschema
@@ -272,6 +367,10 @@ File location options:
   --db-sb-port=PORT    OVN Southbound db ptcp port (default: $DB_SB_PORT)
   --ovn-nb-logfile=FILE OVN Northbound log file (default: $OVN_NB_LOGFILE)
   --ovn-sb-logfile=FILE OVN Southbound log file (default: $OVN_SB_LOGFILE)
+  --db-nb-sync-from-addr=ADDR OVN Northbound active db tcp address (default: $DB_NB_SYNC_FROM_ADDR)
+  --db-nb-sync-from-port=PORT OVN Northdbound active db tcp port (default: $DB_NB_SYNC_FROM_PORT)
+  --db-sb-sync-from-addr=ADDR OVN Southbound active db tcp address (default: $DB_SB_SYNC_FROM_ADDR)
+  --db-sb-sync-from-port=ADDR OVN Southbound active db tcp port (default: $DB_SB_SYNC_FROM_PORT)
 
 Default directories with "configure" option and environment variable override:
   logs: /usr/local/var/log/openvswitch (--with-logdir, OVS_LOGDIR)
@@ -377,6 +476,24 @@ case $command in
     status_controller_vtep)
         daemon_status ovn-controller-vtep || exit 1
         ;;
+    promote_ovnnb)
+        promote_ovnnb
+        ;;
+    promote_ovnsb)
+        promote_ovnsb
+        ;;
+    demote_ovnnb)
+        demote_ovnnb
+        ;;
+    demote_ovnsb)
+        demote_ovnsb
+        ;;
+    status_ovnnb)
+        status_ovnnb
+        ;;
+    status_ovnsb)
+        status_ovnsb
+        ;;
     help)
         usage
         ;;
-- 
1.9.1




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