Hi all,
We are having a sporadic issue with our Gluster mounts that is affecting
several of our Kubernetes environments. We are having trouble understanding
what is causing it, and we could use some guidance from the pros!
Scenario
We have an environment running a single-node Kubernetes with Heketi and several
pods using Gluster mounts. The environment runs fine and the mounts appear to
be healthy for up to several days. Suddenly, one or more (sometimes all)
Gluster mounts report a stale mount and shut down the brick. The affected
containers enter a crash loop that continues indefinitely, until someone
intervenes. To work-around the crash loop, a user needs to trigger the bricks
to be started again--either through manually starting them, restarting the
Gluster pod or restarting the entire node.
Diagnostics
Looking at the glusterd.log file, the error message at the time the problem
starts looks something like this:
got disconnect from stale rpc on
/var/lib/heketi/mounts/vg_c197878af606e71a874ad28e3bd7e4e1/brick_d0456279568a623a16a5508daa89b4d5/brick
This message occurs once for each brick that stops responding. The brick does
not recover on its own. Here is that same message again, with surrounding
context included.
[2019-05-07 11:53:38.663362] I [run.c:241:runner_log]
(-->/usr/lib64/glusterfs/4.1.7/xlator/mgmt/glusterd.so(+0x3a7a5)
[0x7f795f0d77a5]
-->/usr/lib64/glusterfs/4.1.7/xlator/mgmt/glusterd.so(+0xe2765)
[0x7f795f17f765] -->/lib64/libglusterfs.so.0(runner_log+0x115) [0x7f79643180f5]
) 0-management: Ran script:
/var/lib/glusterd/hooks/1/stop/pre/S29CTDB-teardown.sh
--volname=vol_d0a0dcf9903e236f68a3933c3060ec5a --last=no
[2019-05-07 11:53:38.905338] E [run.c:241:runner_log]
(-->/usr/lib64/glusterfs/4.1.7/xlator/mgmt/glusterd.so(+0x3a7a5)
[0x7f795f0d77a5]
-->/usr/lib64/glusterfs/4.1.7/xlator/mgmt/glusterd.so(+0xe26c3)
[0x7f795f17f6c3] -->/lib64/libglusterfs.so.0(runner_log+0x115) [0x7f79643180f5]
) 0-management: Failed to execute script:
/var/lib/glusterd/hooks/1/stop/pre/S30samba-stop.sh
--volname=vol_d0a0dcf9903e236f68a3933c3060ec5a --last=no
[2019-05-07 11:53:38.982785] I [MSGID: 106542]
[glusterd-utils.c:8253:glusterd_brick_signal] 0-glusterd: sending signal 15 to
brick with pid 8951
[2019-05-07 11:53:39.983244] I [MSGID: 106143]
[glusterd-pmap.c:397:pmap_registry_remove] 0-pmap: removing brick
/var/lib/heketi/mounts/vg_c197878af606e71a874ad28e3bd7e4e1/brick_d0456279568a623a16a5508daa89b4d5/brick
on port 49169
[2019-05-07 11:53:39.984656] W
[glusterd-handler.c:6124:__glusterd_brick_rpc_notify] 0-management: got
disconnect from stale rpc on
/var/lib/heketi/mounts/vg_c197878af606e71a874ad28e3bd7e4e1/brick_d0456279568a623a16a5508daa89b4d5/brick
[2019-05-07 11:53:40.316466] I [MSGID: 106131]
[glusterd-proc-mgmt.c:83:glusterd_proc_stop] 0-management: nfs already stopped
[2019-05-07 11:53:40.316601] I [MSGID: 106568]
[glusterd-svc-mgmt.c:235:glusterd_svc_stop] 0-management: nfs service is stopped
[2019-05-07 11:53:40.316644] I [MSGID: 106599]
[glusterd-nfs-svc.c:82:glusterd_nfssvc_manager] 0-management: nfs/server.so
xlator is not installed
[2019-05-07 11:53:40.319650] I [MSGID: 106131]
[glusterd-proc-mgmt.c:83:glusterd_proc_stop] 0-management: bitd already stopped
[2019-05-07 11:53:40.319708] I [MSGID: 106568]
[glusterd-svc-mgmt.c:235:glusterd_svc_stop] 0-management: bitd service is
stopped
[2019-05-07 11:53:40.321091] I [MSGID: 106131]
[glusterd-proc-mgmt.c:83:glusterd_proc_stop] 0-management: scrub already stopped
[2019-05-07 11:53:40.321132] I [MSGID: 106568]
[glusterd-svc-mgmt.c:235:glusterd_svc_stop] 0-management: scrub service is
stopped
The version of gluster we are using (running in a container, using the
gluster/gluster-centos image from dockerhub):
# rpm -qa | grep gluster
glusterfs-rdma-4.1.7-1.el7.x86_64
gluster-block-0.3-2.el7.x86_64
python2-gluster-4.1.7-1.el7.x86_64
centos-release-gluster41-1.0-3.el7.centos.noarch
glusterfs-4.1.7-1.el7.x86_64
glusterfs-api-4.1.7-1.el7.x86_64
glusterfs-cli-4.1.7-1.el7.x86_64
glusterfs-geo-replication-4.1.7-1.el7.x86_64
glusterfs-libs-4.1.7-1.el7.x86_64
glusterfs-client-xlators-4.1.7-1.el7.x86_64
glusterfs-fuse-4.1.7-1.el7.x86_64
glusterfs-server-4.1.7-1.el7.x86_64
The version of gluster running on our Kubernetes node (a CentOS system):
]$ rpm -qa | grep gluster
glusterfs-libs-3.12.2-18.el7.x86_64
glusterfs-3.12.2-18.el7.x86_64
glusterfs-fuse-3.12.2-18.el7.x86_64
glusterfs-client-xlators-3.12.2-18.el7.x86_64
The Kubernetes version:
$ kubectl version
Client Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.5",
GitCommit:"2166946f41b36dea2c4626f90a77706f426cdea2", GitTreeState:"clean",
BuildDate:"2019-03-25T15:19:22Z", GoVersion:"go1.11.5", Compiler:"gc",
Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"13", GitVersion:"v1.13.5",
GitCommit:"2166946f41b36dea2c4626f90a77706f426cdea2", GitTreeState:"clean",
BuildDate:"2019-03-25T15:19:22Z", GoVersion:"go1.11.5", Compiler:"gc",
Platform:"linux/amd64"}
Full Gluster logs available if needed, just let me know how to provide them.
Thanks in advance for any help or suggestions on this!
Best,
Jeff Bischoff
Turbonomic
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