Wordpress on Vultr 768
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Is anyone running a Wordpress site on a 768 MB instance of Vultr?
For a couple of days after initial setup, I was able to install MariaDB, Wordpress, etc, install a theme and some other plugins, and do some other site config. The site was working without issue. Now, almost all the time, the site just gives a "Error connecting to database" error. Upon further investigation, and watching the console, I figured out that the error is happening because the processes keep terminating (mysqld and httpd). Restarting the services fixes the problem for a couple of seconds, but then the server kills them again. When checking memory, the free available memory right after restarting the database server is extremely low. I'm assuming this is why the servers keeps killing the processes.
Is this just a resource issue? Is a 768 MB server too small for a 1 site wordpress site?
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@fuznutz04 said in Wordpress on Vultr 768:
Is anyone running a Wordpress site on a 768 MB instance of Vultr?
For a couple of days after initial setup, I was able to install MariaDB, Wordpress, etc, install a theme and some other plugins, and do some other site config. The site was working without issue. Now, almost all the time, the site just gives a "Error connecting to database" error. Upon further investigation, and watching the console, I figured out that the error is happening because the processes keep terminating (mysqld and httpd). Restarting the services fixes the problem for a couple of seconds, but then the server kills them again. When checking memory, the free available memory right after restarting the database server is extremely low. I'm assuming this is why the servers keeps killing the processes.
Is this just a resource issue? Is a 768 MB server too small for a 1 site wordpress site?
Depends on the traffic and how RAM accounting works at Vultr, but 768 MB is plenty if you don't face like 100.000 hits per hour. Most Wordpress sites only have like 128 MB, maybe 256 MB.
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So you need to check out other possible causes for this
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@thwr said in Wordpress on Vultr 768:
So you need to check out other possible causes for this
That's what I thought too. It's 1 site with currently no traffic at all. Any performance tuning I need to do on Apache, or mariaDB?
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@fuznutz04 said in Wordpress on Vultr 768:
@thwr said in Wordpress on Vultr 768:
So you need to check out other possible causes for this
That's what I thought too. It's 1 site with currently no traffic at all. Any performance tuning I need to do on Apache, or mariaDB?
I don't know what exactly Vultr offers, is that a VM / container / jail? Just asking because you are able to check the running processes. RAM should be enough either way.
I would first check the MariaDB/MySQL logs. The database shouldn't terminate itself without a reason.
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@thwr said in Wordpress on Vultr 768:
I don't know what exactly Vultr offers, is that a VM / container / jail?
Full virtualization via KVM.
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So a few things to get started:
- You need to configure your swap space, Vultr does not do this for you. So you are swapless and running with much less memory than you should be in that regard.
- 768MB is not very good for web serving. It can work, but you need to tune things, Apache especially as it will sprawl instantly.
- You need to look in the logs and see why the services said that they stopped.
- You need to look at the SAR reports to see what memory is doing. Move SAR up to every minute instead of every ten minutes for better info.
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@fuznutz04 said in Wordpress on Vultr 768:
Any performance tuning I need to do on Apache, or mariaDB?
Yes, in HTTPD (Apache) you need to reduce the number of available idle threads. By default, Apache expects more excess memory and will use more than necessary.
Check out the Apache tunings here, they might apply:
https://mangolassi.it/topic/7011/reducing-memory-consumption-in-elastix-2
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@thwr said in Wordpress on Vultr 768:
Most Wordpress sites only have like 128 MB, maybe 256 MB.
I doubt that most do, as it's effectively impossible for many years to even get VPS that small. Rackspace minimum is 512MB and DO/Vultr is like 768MB.
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@scottalanmiller said in Wordpress on Vultr 768:
So a few things to get started:
- You need to configure your swap space, Vultr does not do this for you. So you are swapless and running with much less memory than you should be in that regard.
- 768MB is not very good for web serving. It can work, but you need to tune things, Apache especially as it will sprawl instantly.
- You need to look in the logs and see why the services said that they stopped.
- You need to look at the SAR reports to see what memory is doing. Move SAR up to every minute instead of every ten minutes for better info.
- I setup swap previously.
free -m total used free shared buff/cache available Mem: 740 255 247 1 237 369 Swap: 1023 195 828-
I figured this was too low, but thought it might be manageable, especially just for testing and/or low usage.
161107 11:04:55 mysqld_safe mysqld from pid file /var/run/mariadb/mariadb.pid ended 161107 11:05:52 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql 161107 11:05:52 [Note] /usr/libexec/mysqld (mysqld 5.5.47-MariaDB) starting as process 4727 ... 161107 11:05:52 InnoDB: The InnoDB memory heap is disabled 161107 11:05:52 InnoDB: Mutexes and rw_locks use GCC atomic builtins 161107 11:05:52 InnoDB: Compressed tables use zlib 1.2.7 161107 11:05:52 InnoDB: Using Linux native AIO 161107 11:05:52 InnoDB: Initializing buffer pool, size = 32.0M 161107 11:05:52 InnoDB: Completed initialization of buffer pool InnoDB: Error: log file ./ib_logfile0 is of different size 0 5242880 bytes InnoDB: than specified in the .cnf file 0 8388608 bytes! InnoDB: Possible causes for this error: (a) Incorrect log file is used or log file size is changed (b) In case default size is used this log file is from 10.0 (c) Log file is corrupted or there was not enough disk space In case (b) you need to set innodb_log_file_size = 48M 161107 11:05:52 [ERROR] Plugin 'InnoDB' init function returned error. 161107 11:05:52 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 161107 11:05:52 [Note] Plugin 'FEEDBACK' is disabled. 161107 11:05:52 [ERROR] Unknown/unsupported storage engine: InnoDB 161107 11:05:52 [ERROR] Aborting 161107 11:05:52 [Note] /usr/libexec/mysqld: Shutdown complete 161107 11:05:52 mysqld_safe mysqld from pid file /var/run/mariadb/mariadb.pid ended- Running every 2 seconds, for 20 times, here is the output of sar -r when starting mariadb
[root@web01 mariadb]# sar -r 2 20 Linux 3.10.0-327.18.2.el7.x86_64 (web01) 11/07/2016 _x86_64_ (1 CPU) 11:36:42 AM kbmemfree kbmemused %memused kbbuffers kbcached kbcommit %commit kbactive kbinact kbdirty 11:36:44 AM 101484 657248 86.62 804 38136 1221556 67.59 263708 321164 4 11:36:46 AM 60488 698244 92.03 140 55864 1595136 88.26 292536 333572 20 11:36:48 AM 68760 689972 90.94 2140 81072 1627604 90.06 287536 332852 24 11:36:50 AM 88352 670380 88.36 144 44408 1619720 89.62 307504 294980 96 11:36:52 AM 52684 706048 93.06 80 20128 1649120 91.25 314700 325640 0 11:36:54 AM 56232 702500 92.59 88 8924 1716380 94.97 318116 318592 4 11:36:56 AM 59236 699496 92.19 112 14368 1801240 99.66 317428 315804 0 11:36:58 AM 57804 700928 92.38 84 28560 1844356 102.05 317084 317404 0 11:37:00 AM 56908 701824 92.50 84 15028 1924244 106.47 317200 317500 0 11:37:02 AM 60052 698680 92.09 84 3912 2013736 111.42 314188 315084 0 11:37:04 AM 57332 701400 92.44 84 24492 2090780 115.69 303708 324764 0 11:37:06 AM 57672 701060 92.40 100 23932 2132812 118.01 311100 316180 0 11:37:08 AM 49352 709380 93.50 84 28520 2311044 127.87 308568 320432 0 11:37:10 AM 42416 716316 94.41 80 21308 2379376 131.65 318500 316644 0 11:37:12 AM 59104 699628 92.21 84 17616 2515080 139.16 306896 309736 0 11:37:14 AM 56912 701820 92.50 88 26100 2626604 145.33 307340 310396 0 11:37:16 AM 75388 683344 90.06 1192 32580 2726348 150.85 282232 314996 0 11:37:18 AM 52532 706200 93.08 324 16052 2226088 123.17 304344 313860 0 11:37:20 AM 41032 717700 94.59 1296 18176 2335440 129.22 306512 318952 0 11:37:22 AM 40488 718244 94.66 120 19404 2517688 139.31 305460 320248 20 Average: 59711 699021 92.13 361 26929 2043718 113.08 305233 317940 8```` -
This might be a silly question but just to be 100% sure.... what is the disk space usage?
df -h -
Doesn't look like memory is the problem. You don't have a lot, but it's not being used.
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@scottalanmiller said in Wordpress on Vultr 768:
This might be a silly question but just to be 100% sure.... what is the disk space usage?
df -h[root@web01 mariadb]# df -h Filesystem Size Used Avail Use% Mounted on /dev/vda1 15G 3.1G 11G 22% / devtmpfs 362M 0 362M 0% /dev tmpfs 371M 0 371M 0% /dev/shm tmpfs 371M 9.6M 361M 3% /run tmpfs 371M 0 371M 0% /sys/fs/cgroup tmpfs 75M 0 75M 0% /run/user/1000 -
This is the bit that matters. InnoDB is freaking out.
InnoDB: Error: log file ./ib_logfile0 is of different size 0 5242880 bytes InnoDB: than specified in the .cnf file 0 8388608 bytes! InnoDB: Possible causes for this error: (a) Incorrect log file is used or log file size is changed (b) In case default size is used this log file is from 10.0 (c) Log file is corrupted or there was not enough disk space In case (b) you need to set innodb_log_file_size = 48M 161107 11:05:52 [ERROR] Plugin 'InnoDB' init function returned error. 161107 11:05:52 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 161107 11:05:52 [Note] Plugin 'FEEDBACK' is disabled. 161107 11:05:52 [ERROR] Unknown/unsupported storage engine: InnoDB 161107 11:05:52 [ERROR] AbortingAnd it is not memory that it is complaining about.
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@fuznutz04 Okay, so plenty of disk space.
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Which OS is this? What is the source of MariaDB?
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@scottalanmiller said in Wordpress on Vultr 768:
Which OS is this? What is the source of MariaDB?
This is CentOS7. I set this server up a few months ago following this guide: https://jaredbusch.com/2014/08/11/how-to-install-wordpress-on-centos-7-minimal/
As far as I remember, I don't remember deviating from it.
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I see, so this has been running for a while and only recently started having the problem? It seems like InnoDB is having an issue registering as an engine.
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@fuznutz04 said in Wordpress on Vultr 768:
@scottalanmiller said in Wordpress on Vultr 768:
Which OS is this? What is the source of MariaDB?
This is CentOS7. I set this server up a few months ago following this guide: https://jaredbusch.com/2014/08/11/how-to-install-wordpress-on-centos-7-minimal/
As far as I remember, I don't remember deviating from it.
I need to update that guide a bit one of these days.
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@scottalanmiller said in Wordpress on Vultr 768:
I see, so this has been running for a while and only recently started having the problem? It seems like InnoDB is having an issue registering as an engine.
Yes, it was runnning fine for at least a week, then I abandoned it for a few months, and recently revisited and started having these issues.
