Shutdown mongos for upgrade

Question

I am upgrading a mongo sharded cluster, and am in the first step of replacing the mongos process. Can I just kill this process or is there a safer way to shut it down before replacing it?

Answer 1

It is the answer. But may be you misunderstood. You cannot shutdown mongos from command line, but you have to logon to the shell. Here is the result I am trying on my own:

$ mongo --port 27077 (please replace with your own port on mongos instance)

**mongos**> db.shutdownServer({timeoutSecs:30})
shutdown command only works with the admin database; try 'use admin'
mongos> use admin
switched to db admin
mongos> db.shutdownServer({timeoutSecs:30})
2015-02-27T12:53:54.408+0800 DBClientCursor::init call() failed
**server should be down...**
2015-02-27T12:53:54.410+0800 trying reconnect to 127.0.0.1:27077 (127.0.0.1) failed
2015-02-27T12:53:54.410+0800 warning: Failed to connect to 127.0.0.1:27077, reason: errno:111 Connection refused
2015-02-27T12:53:54.410+0800 reconnect 127.0.0.1:27077 (127.0.0.1) failed failed couldn't connect to server 127.0.0.1:27077 (127.0.0.1), connection attempt failed
2015-02-27T12:53:54.413+0800 trying reconnect to 127.0.0.1:27077 (127.0.0.1) failed
2015-02-27T12:53:54.413+0800 warning: Failed to connect to 127.0.0.1:27077, reason: errno:111 Connection refused
2015-02-27T12:53:54.413+0800 reconnect 127.0.0.1:27077 (127.0.0.1) failed failed couldn't connect to server 127.0.0.1:27077 (127.0.0.1), connection attempt failed
> 

Try to run "top" or "htop" to display all processes running on your computer. You shall see the "mongos" process has gone. Read the log file. Here is the last two lines of my log:

2015-02-27T12:53:54.406+0800 [conn1] terminating, shutdown command received
2015-02-27T12:53:54.406+0800 [conn1] dbexit: shutdown called rc:0 shutdown called

And here is the link of my testing script:

https://github.com/babycaseny/QuickStart/blob/master/StartShard.sh

Note that you have to replace the "localhost" in the mongod/mongos command with the hostname of your computer, or you will not be able to config your shards.

See also this one:

https://groups.google.com/forum/#!topic/mongodb-user/TQLlRI6HG1M

In case you need a command line to do the work, here is one:

mongo admin --port portnumber --eval "db.shutdownServer()"

Notice that you have to run the command in localhost.