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Dear community,
actually, I'm running a 3 Node GlusterFS. Simple Wordpress pages needs 4 -10 seconds to load. Since a month we have also problems with memory leaks. All 3 nodes got 24 GB RAM (before 12 GB RAM) but GlusterFS use all the RAM. If all the RAM is used the virtual maschine loose there mountpoint. After remount everything starts again and that 2-3 times daily.
# Gluster Version: 8.0
#Affected process: This is a snapshot from top where the process starts with low memory usage and run so long RAM is available.
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
869835 root 20 0 20,9g 20,3g 4340 S 2,3 86,5 152:10.62 /usr/sbin/glusterfs --process-name fuse --volfile-server=vm01 --volfile-server=vm02 --volfile-id=/gluster /var/www
# gluster volume info Volume Name: gluster
Type: Replicate Volume ID: c6d3beb1-b841-45e8-aa64-bb2be1e36e39 Status: Started Snapshot Count: 0 Number of Bricks: 1 x 3 = 3 Transport-type: tcp Bricks: Brick1: vm01:/srv/glusterfs Brick2: vm02:/srv/glusterfs Brick3: vm03:/srv/glusterfs Options Reconfigured: performance.io-cache: on performance.write-behind: on performance.flush-behind: on auth.allow: 10.10.10.* performance.readdir-ahead: on performance.quick-read: off performance.cache-size: 1GB performance.cache-refresh-timeout: 10 performance.read-ahead: off performance.write-behind-window-size: 4MB network.ping-timeout: 2 performance.io-thread-count: 32 performance.cache-max-file-size: 2MB performance.md-cache-timeout: 60 features.cache-invalidation: on features.cache-invalidation-timeout: 600 performance.stat-prefetch: on network.inode-lru-limit: 90000
# Logs I can't find any critical messages on all gluster logs, but in syslog I found the oom-kill. After that, the mountpoint is history.
oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/srv-web.mount,task=glusterfs,pid=961,uid=0
And after the remount it starts again to use more and more memory.
[68263.478730] Out of memory: Killed process 961 (glusterfs) total-vm:21832212kB, anon-rss:21271576kB, file-rss:0kB, shmem-rss:0kB, UID:0 pgtables:41792kB oom_score_adj:0 [68264.243608] oom_reaper: reaped process 961 (glusterfs), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Alternatively I can also activate SWAP but this slow down the load time extremely if GlusterFS starts to use SWAP after all RAM is used.
If you need more information let me know it and i will send this too.
Best regards Benjamin
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