If I might chip in here, this can cause an issue when rebooting
nodes unless you make sure to stop the Gluster processes first. If
you don't stop the processes, then the Gluster volumes can pause
for the default 42 seconds(?) until the other nodes time out the
rebooting node. This is of course long enough to cause any VMs
running their volumes on gluster to show I/O errors and re-mount
them as read-only potentially causing all sorts of mischief.
I *think* there's a systemd solution to this somewhere, perhaps the RedHat packages?, that does stop the gluster processes prior to a reboot or halt.
Certainly the Debian packages *don't* have this solution in place. I wish they did but I've never mastered enough systemd foo to sort if out myself. :-).
Ronny
Hi Anant,
It was intentional design decision to not stop any gluster processes if Glusterd need to be upgraded or if Glusterd crashes. Because of this Volume availability will not be affected if any issues with Glusterd or Glusterd is upgraded. All the mounts will reconnect once the Glusterd comes back up. CLI operations from that node may not be available but IO will not be affected if the Glusterd is down (New mounts can't be created, but existing mounts should work without Glusterd).
stop-all-gluster-processes.sh is available as part of installation, it can be used to stop all the processes (Check in /usr/share/glusterfs/scripts)
--
Thanks and RegardsAravinda
Kadalu Technologies
---- On Mon, 05 Feb 2024 22:40:30 +0530 Anant Saraswat <anant.saraswat@xxxxxxxxxxxxxx> wrote ---
________Hello Everyone,
I am using GlusterFS 9.4, and whenever we use the systemctl command to stop the Gluster server, it leaves many Gluster processes running. So, I just want to check how to shut down the Gluster server in a graceful manner.
Is there any specific sequence or trick I need to follow? Currently, I am using the following command:
[root@master2 ~]# systemctl stop glusterd.service
[root@master2 ~]# ps aux | grep gluster
root 2710138 14.1 0.0 2968372 216852 ? Ssl Jan27 170:27 /usr/sbin/glusterfsd -s master2 --volfile-id tier1data.master2.opt-tier1data2019-brick -p /var/run/gluster/vols/tier1data/master2-opt-tier1data2019-brick.pid -S /var/run/gluster/97da28e3d5c23317.socket --brick-name /opt/tier1data2019/brick -l /var/log/glusterfs/bricks/opt-tier1data2019-brick.log --xlator-option *-posix.glusterd-uuid=c1591bde-df1c-41b4-8cc3-5eaa02c5b89d --process-name brick --brick-port 49152 --xlator-option tier1data-server.listen-port=49152
root 2710196 0.0 0.0 1298116 11544 ? Ssl Jan27 0:01 /usr/sbin/glusterfs -s localhost --volfile-id shd/tier1data -p /var/run/gluster/shd/tier1data/tier1data-shd.pid -l /var/log/glusterfs/glustershd.log -S /var/run/gluster/1ac2284f75671ffa.socket --xlator-option *replicate*.node-uuid=c1591bde-df1c-41b4-8cc3-5eaa02c5b89d --process-name glustershd --client-pid=-6
root 3730742 0.0 0.0 288264 14388 ? Ssl 18:44 0:00 /usr/bin/python3 /usr/libexec/glusterfs/python/syncdaemon/gsyncd.py --path=/opt/tier1data2019/brick --monitor -c /var/lib/glusterd/geo-replication/tier1data_drtier1data_drtier1data/gsyncd.conf --iprefix=/var :tier1data --glusterd-uuid=c1591bde-df1c-41b4-8cc3-5eaa02c5b89d drtier1data::drtier1data
root 3730763 2.4 0.0 2097216 35904 ? Sl 18:44 0:09 python3 /usr/libexec/glusterfs/python/syncdaemon/gsyncd.py worker tier1data drtier1data::drtier1data --feedback-fd 9 --local-path /opt/tier1data2019/brick --local-node master2 --local-node-id c1591bde-df1c-41b4-8cc3-5eaa02c5b89d --slave-id eca32e08-c3f8-4883-bef5-84bfb89f4d56 --subvol-num 1 --resource-remote drtier1data --resource-remote-id 28f3e75b-56aa-43a1-a0ea-a0e5d44d59ea
root 3730768 0.7 0.0 50796 9668 ? S 18:44 0:02 ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i /var/lib/glusterd/geo-replication/secret.pem -p 22 -oControlMaster=auto -S /tmp/gsyncd-aux-ssh-ep7a14up/75785990b3233f5dbbab9f43cc3ed895.sock drtier1data /nonexistent/gsyncd slave tier1data drtier1data::drtier1data --master-node master2 --master-node-id c1591bde-df1c-41b4-8cc3-5eaa02c5b89d --master-brick /opt/tier1data2019/brick --local-node drtier1data --local-node-id 28f3e75b-56aa-43a1-a0ea-a0e5d44d59ea --slave-timeout 120 --slave-log-level INFO --slave-gluster-log-level INFO --slave-gluster-command-dir /usr/sbin --master-dist-count 1
root 3730795 1.1 0.0 1108268 55596 ? Ssl 18:44 0:04 /usr/sbin/glusterfs --aux-gfid-mount --acl --log-level=INFO --log-file=/var/log/glusterfs/geo-replication/tier1data_drtier1data_drtier1data/mnt-opt-tier1data2019-brick.log --volfile-server=localhost --volfile-id=tier1data --client-pid=-1 /tmp/gsyncd-aux-mount-9210kh43
root 3772665 0.0 0.0 12208 2400 ? S 18:51 0:00 rsync -aR0 --inplace --files-from=- --super --stats --numeric-ids --no-implied-dirs --existing --xattrs --acls --ignore-missing-args . -e ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i /var/lib/glusterd/geo-replication/secret.pem -p 22 -oControlMaster=auto -S /tmp/gsyncd-aux-ssh-ep7a14up/75785990b3233f5dbbab9f43cc3ed895.sock drtier1data:/proc/897118/cwd
root 3772667 0.0 0.0 44156 5640 ? S 18:51 0:00 ssh -oPasswordAuthentication=no -oStrictHostKeyChecking=no -i /var/lib/glusterd/geo-replication/secret.pem -p 22 -oControlMaster=auto -S /tmp/gsyncd-aux-ssh-ep7a14up/75785990b3233f5dbbab9f43cc3ed895.sock drtier1data rsync --server -logDtpAXRe.LsfxC --super --stats --numeric-ids --existing --inplace --no-implied-dirs . /proc/897118/cwd
For now, We are using https://github.com/gluster/glusterfs/blob/master/extras/stop-all-gluster-processes.sh to kill all the remaining processes.
Thanks,
Anant
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