Join 1M+ other developers and:
- Get help and share knowledge in Q&A
- Subscribe to topics of interest
- Get courses & tools that help you grow as a developer or small business owner
Why my CentOS droplet is eating all the RAM memory?
I started with a 2vCPU 2GB CentOS 7 x64 droplet installed from marketplace with a Plesk image. I have only create a Wordpress website with no more than 400 visits per month and followed the initial server setup for CentOS 7 on DigitalOcean.
Then I have started getting alerts from the DigitalOcean monitoring service because the droplet was using more than 70% of memory. I receive those mails 7 times per day, memory usage and resolved ones.
So I thought I was running out of memory, then I have purchased 2GB extra. So my droplet is now a 2vCPU 4GB. After 3 days, same as before, the alert emails for memory beyond 70% started to get my inbox.
At this particular moment, the server is upside that 70% of memory so I ran the command I know DigitalOcean uses to calculate memory (https://www.digitalocean.com/docs/monitoring/resources/glossary-of-terms/#memory)
The results are:
MemTotal: 3880364 kB MemFree: 287080 kB MemAvailable: 2561780 kB Buffers: 32 kB Cached: 994716 kB SwapCached: 0 kB Active: 1224116 kB Inactive: 455532 kB Active(anon): 769364 kB Inactive(anon): 27284 kB Active(file): 454752 kB Inactive(file): 428248 kB Unevictable: 0 kB Mlocked: 0 kB SwapTotal: 0 kB SwapFree: 0 kB Dirty: 16 kB Writeback: 0 kB AnonPages: 684948 kB Mapped: 101816 kB Shmem: 111748 kB Slab: 1750432 kB SReclaimable: 1678876 kB SUnreclaim: 71556 kB KernelStack: 5552 kB PageTables: 17372 kB NFS_Unstable: 0 kB Bounce: 0 kB WritebackTmp: 0 kB CommitLimit: 1940180 kB Committed_AS: 3978072 kB VmallocTotal: 34359738367 kB VmallocUsed: 95708 kB VmallocChunk: 34359537660 kB HardwareCorrupted: 0 kB AnonHugePages: 344064 kB CmaTotal: 0 kB CmaFree: 0 kB HugePages_Total: 0 HugePages_Free: 0 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 2048 kB DirectMap4k: 98276 kB DirectMap2M: 4096000 kB DirectMap1G: 0 kB
free -m results are:
total used free shared buff/cache available Mem: 3789 935 240 109 2613 2464 Swap: 0 0 0
Plesk on the other side, trough Grafana is telling me that
memory:memory-used:value 858 Mb
memory:memory-cached:value 971 Mb
memory:memory-slab_recl:value 1.6 Gb
Any ideas? Anything that would help me understand this situation and solve it?
These answers are provided by our Community. If you find them useful, show some love by clicking the heart. If you run into issues leave a comment, or add your own answer to help others.×