Help with Crashing Droplet

Hey all,

I spun up a new Ubuntu 20.04 1GB RAM droplet using Digital Ocean 1-click WordPress App a few weeks back and began developing the site. I’ve kept my WordPress plugins, themes, etc. pretty light (Wordfence is probably the heaviest one in use) and I haven’t uploaded much media just yet. I noticed the other day that I couldn’t access my site in the browser and after much loading, a message was just displayed that read “Error establishing a connection to the database” (I’m now behind cloudflare and just receive a timeout error when this occurs). During this time I tried to login to my droplet via SSH which was also very sluggish. Today I experienced a the same issue so I used grep -Ei 'oom|out of memory' /var/log/syslog to search for anything in the logs that might cause this issue and the following was displayed:

Jan 25 15:18:40 droplet kernel: [599977.961643] ib_pg_flush_co invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0
Jan 25 15:18:40 droplet kernel: [599977.961722]  oom_kill_process.cold+0xb/0x10
Jan 25 15:18:40 droplet kernel: [599977.961936] [  pid  ]   uid  tgid total_vm      rss pgtables_bytes swapents oom_score_adj name
Jan 25 15:18:40 droplet kernel: [599977.962031] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/mysql.service,task=mysqld,pid=31337,uid=112
Jan 25 15:18:40 droplet kernel: [599977.962130] Out of memory: Killed process 31337 (mysqld) total-vm:1342776kB, anon-rss:439804kB, file-rss:0kB, shmem-rss:0kB, UID:112 pgtables:1264kB oom_score_adj:0
Jan 25 15:18:40 droplet kernel: [599978.039990] oom_reaper: reaped process 31337 (mysqld), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB
Jan 25 15:26:50 droplet kernel: [600468.028506] systemd invoked oom-killer: gfp_mask=0x100cca(GFP_HIGHUSER_MOVABLE), order=0, oom_score_adj=0
Jan 25 15:26:50 droplet kernel: [600468.028534]  oom_kill_process.cold+0xb/0x10
Jan 25 15:26:50 droplet kernel: [600468.028658] [  pid  ]   uid  tgid total_vm      rss pgtables_bytes swapents oom_score_adj name
Jan 25 15:26:50 droplet kernel: [600468.028754] oom-kill:constraint=CONSTRAINT_NONE,nodemask=(null),cpuset=/,mems_allowed=0,global_oom,task_memcg=/system.slice/mysql.service,task=mysqld,pid=67924,uid=112
Jan 25 15:26:50 droplet kernel: [600468.028885] Out of memory: Killed process 67924 (mysqld) total-vm:1310584kB, anon-rss:385228kB, file-rss:0kB, shmem-rss:0kB, UID:112 pgtables:1132kB oom_score_adj:0
Jan 25 15:26:50 droplet kernel: [600468.092875] oom_reaper: reaped process 67924 (mysqld), now anon-rss:0kB, file-rss:0kB, shmem-rss:0kB

MySQLs memory usage seems to be higher than normal and causing the droplet to run out of memory. Having such a small website with little to no real traffic I don’t think its WordPress or the droplets memory size, but am unsure if this is some type of attack or some configuration that was missed. Any insights on how to resolve or troubleshoot would be much appreciated!