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-rw-r--r--compass/deploy/ansible/openstack_juno/roles/ha/templates/failover.j265
1 files changed, 65 insertions, 0 deletions
diff --git a/compass/deploy/ansible/openstack_juno/roles/ha/templates/failover.j2 b/compass/deploy/ansible/openstack_juno/roles/ha/templates/failover.j2
new file mode 100644
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+++ b/compass/deploy/ansible/openstack_juno/roles/ha/templates/failover.j2
@@ -0,0 +1,65 @@
+import ConfigParser, os, socket
+import logging as LOG
+import pxssh
+import sys
+import re
+
+LOG_FILE="/var/log/mysql_failover"
+try:
+ os.remove(LOG_FILE)
+except:
+ pass
+
+LOG.basicConfig(format='%(asctime)s %(message)s', datefmt='%m/%d/%Y %I:%M:%S %p', filename=LOG_FILE,level=LOG.DEBUG)
+ha_vip = {{ HA_VIP }}
+LOG.info("ha_vip: %s" % ha_vip)
+
+#ha_vip = "10.1.0.50"
+galera_path = '/etc/mysql/conf.d/wsrep.cnf'
+pattern = re.compile(r"gcomm://(?P<prev_ip>.*)")
+
+def ssh_get_hostname(ip):
+ try:
+ s = pxssh.pxssh()
+ s.login("%s" % ip, "root", "root")
+ s.sendline('hostname') # run a command
+ s.prompt() # match the prompt
+ result = s.before.strip() # print everything before the prompt.
+ return result.split(os.linesep)[1]
+ except pxssh.ExceptionPxssh as e:
+ LOG.error("pxssh failed on login.")
+ raise
+
+def failover(mode):
+ config = ConfigParser.ConfigParser()
+ config.optionxform = str
+ config.readfp(open(galera_path))
+ wsrep_cluster_address = config.get("mysqld", "wsrep_cluster_address")
+ wsrep_cluster_address = pattern.match(wsrep_cluster_address).groupdict()["prev_ip"]
+
+ LOG.info("old wsrep_cluster_address = %s" % wsrep_cluster_address)
+
+ if mode == "master":
+ # refresh wsrep_cluster_address to null
+ LOG.info("I'm being master, set wsrep_cluster_address to null")
+ wsrep_cluster_address = ""
+
+ elif mode == "backup":
+ # refresh wsrep_cluster_address to master int ip
+ hostname = ssh_get_hostname(ha_vip)
+ wsrep_cluster_address = socket.gethostbyname(hostname)
+ LOG.info("I'm being slave, set wsrep_cluster_address to master internal ip")
+
+ LOG.info("new wsrep_cluster_address = %s" % wsrep_cluster_address)
+ wsrep_cluster_address = "gcomm://%s" % wsrep_cluster_address
+ config.set("mysqld", "wsrep_cluster_address", wsrep_cluster_address)
+ with open(galera_path, 'wb') as fp:
+ #config.write(sys.stdout)
+ config.write(fp)
+
+ os.system("service mysql restart")
+ LOG.info("failover success!!!")
+
+if __name__ == "__main__":
+ LOG.debug("call me: %s" % sys.argv)
+ failover(sys.argv[1])