I move client wordpress sites from one VPS to another, it all went smooth until I moved a site that kills mysql (and, consequently, all other wp sites). It used to work fine on the previous VPS.
Here's the info I have so far. Before opening in browser that site, systemctl status mysql.service -l gives
● mysql.service - MySQL Community Server
Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled)
Active: active (running) since Wed 2015-11-11 08:48:22 MSK; 14min ago
Process: 6404 ExecStartPost=/usr/share/mysql/mysql-systemd-start post (code=exited, status=0/SUCCESS)
Process: 6400 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS)
Main PID: 6403 (mysqld_safe)
CGroup: /system.slice/mysql.service
├─6403 /bin/sh /usr/bin/mysqld_safe
└─6761 /usr/sbin/mysqld --basedir=/usr --datadir=/var/lib/mysql --plugin-dir=/usr/lib/mysql/plugin --log-error=/var/log/mysql/error.log --pid-file=/var/run/mysqld/mysqld.pid --socket=/var/run/mysqld/mysqld.sock --port=3306
Nov 11 08:48:21 jupiter-clean systemd[1]: Starting MySQL Community Server...
Nov 11 08:48:21 jupiter-clean mysqld_safe[6403]: 151111 08:48:21 mysqld_safe Can't log to error log and syslog at the same time. Remove all --log-error configuration options for --syslog to take effect.
Nov 11 08:48:21 jupiter-clean mysqld_safe[6403]: 151111 08:48:21 mysqld_safe Logging to '/var/log/mysql/error.log'.
Nov 11 08:48:21 jupiter-clean mysqld_safe[6403]: 151111 08:48:21 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql
Nov 11 08:48:22 jupiter-clean systemd[1]: Started MySQL Community Server.
Nov 11 09:03:01 jupiter-clean systemd[1]: Started MySQL Community Server.
Going to that site makes systemctl status mysql.service -l output
● mysql.service - MySQL Community Server Loaded: loaded (/lib/systemd/system/mysql.service; enabled; vendor preset: enabled) Active: inactive (dead) since Wed 2015-11-11 09:05:14 MSK; 1min 17s ago Process: 6404 ExecStartPost=/usr/share/mysql/mysql-systemd-start post (code=exited, status=0/SUCCESS) Process: 6403 ExecStart=/usr/bin/mysqld_safe (code=exited, status=0/SUCCESS) Process: 6400 ExecStartPre=/usr/share/mysql/mysql-systemd-start pre (code=exited, status=0/SUCCESS) Main PID: 6403 (code=exited, status=0/SUCCESS) Nov 11 08:48:21 jupiter-clean systemd[1]: Starting MySQL Community Server... Nov 11 08:48:21 jupiter-clean mysqld_safe[6403]: 151111 08:48:21 mysqld_safe Can't log to error log and syslog at the same time. Remove all --log-error configuration options for --syslog to take effect. Nov 11 08:48:21 jupiter-clean mysqld_safe[6403]: 151111 08:48:21 mysqld_safe Logging to '/var/log/mysql/error.log'. Nov 11 08:48:21 jupiter-clean mysqld_safe[6403]: 151111 08:48:21 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql Nov 11 08:48:22 jupiter-clean systemd[1]: Started MySQL Community Server. Nov 11 09:03:01 jupiter-clean systemd[1]: Started MySQL Community Server. Nov 11 09:05:14 jupiter-clean mysqld_safe[6403]: 151111 09:05:14 mysqld_safe Number of processes running now: 0 Nov 11 09:05:14 jupiter-clean mysqld_safe[6403]: 151111 09:05:14 mysqld_safe mysqld restarted Nov 11 09:05:14 jupiter-clean mysqld_safe[6403]: 151111 09:05:14 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
Here's the /var/log/mysql/error.log:
151111 09:05:14 mysqld_safe Number of processes running now: 0 151111 09:05:14 mysqld_safe mysqld restarted 2015-11-11 09:05:14 0 [Warning] TIMESTAMP with implicit DEFAULT value is deprecated. Please use --explicit_defaults_for_timestamp server option (see documentation for more details). 2015-11-11 09:05:14 0 [Note] /usr/sbin/mysqld (mysqld 5.6.27-0ubuntu1) starting as process 6929 ... 2015-11-11 09:05:14 6929 [Warning] Buffered warning: Changed limits: max_open_files: 1024 (requested 5000) 2015-11-11 09:05:14 6929 [Warning] Buffered warning: Changed limits: table_open_cache: 431 (requested 2000) 2015-11-11 09:05:14 6929 [Warning] Using unique option prefix myisam-recover instead of myisam-recover-options is deprecated and will be removed in a future release. Please use the full name instead. 2015-11-11 09:05:14 6929 [Note] Plugin 'FEDERATED' is disabled. 2015-11-11 09:05:14 6929 [ERROR] Function 'innodb' already exists 2015-11-11 09:05:14 6929 [Warning] Couldn't load plugin named 'innodb' with soname 'ha_innodb.so'. 2015-11-11 09:05:14 6929 [ERROR] Function 'federated' already exists 2015-11-11 09:05:14 6929 [Warning] Couldn't load plugin named 'federated' with soname 'ha_federated.so'. 2015-11-11 09:05:14 6929 [ERROR] Function 'blackhole' already exists 2015-11-11 09:05:14 6929 [Warning] Couldn't load plugin named 'blackhole' with soname 'ha_blackhole.so'. 2015-11-11 09:05:14 6929 [ERROR] Function 'archive' already exists 2015-11-11 09:05:14 6929 [Warning] Couldn't load plugin named 'archive' with soname 'ha_archive.so'. 2015-11-11 09:05:14 6929 [Note] InnoDB: Using atomics to ref count buffer pool pages 2015-11-11 09:05:14 6929 [Note] InnoDB: The InnoDB memory heap is disabled 2015-11-11 09:05:14 6929 [Note] InnoDB: Mutexes and rw_locks use GCC atomic builtins 2015-11-11 09:05:14 6929 [Note] InnoDB: Memory barrier is not used 2015-11-11 09:05:14 6929 [Note] InnoDB: Compressed tables use zlib 1.2.8 2015-11-11 09:05:14 6929 [Note] InnoDB: Using Linux native AIO 2015-11-11 09:05:14 6929 [Note] InnoDB: Using CPU crc32 instructions 2015-11-11 09:05:14 6929 [Note] InnoDB: Initializing buffer pool, size = 128.0M InnoDB: mmap(137363456 bytes) failed; errno 12 2015-11-11 09:05:14 6929 [ERROR] InnoDB: Cannot allocate memory for the buffer pool 2015-11-11 09:05:14 6929 [ERROR] Plugin 'InnoDB' init function returned error. 2015-11-11 09:05:14 6929 [ERROR] Plugin 'InnoDB' registration as a STORAGE ENGINE failed. 2015-11-11 09:05:14 6929 [ERROR] Unknown/unsupported storage engine: InnoDB 2015-11-11 09:05:14 6929 [ERROR] Aborting 2015-11-11 09:05:14 6929 [Note] Binlog end 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'partition' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'BLACKHOLE' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'ARCHIVE' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'PERFORMANCE_SCHEMA' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_SYS_DATAFILES' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_SYS_TABLESPACES' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN_COLS' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_SYS_FOREIGN' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_SYS_FIELDS' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_SYS_COLUMNS' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_SYS_INDEXES' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_SYS_TABLESTATS' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_SYS_TABLES' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_FT_INDEX_TABLE' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_FT_INDEX_CACHE' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_FT_CONFIG' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_FT_BEING_DELETED' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_FT_DELETED' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_FT_DEFAULT_STOPWORD' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_METRICS' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_BUFFER_POOL_STATS' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE_LRU' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_BUFFER_PAGE' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX_RESET' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_CMP_PER_INDEX' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_CMPMEM_RESET' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_CMPMEM' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_CMP_RESET' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_CMP' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_LOCK_WAITS' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_LOCKS' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'INNODB_TRX' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'CSV' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'MEMORY' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'MRG_MYISAM' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'MyISAM' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'sha256_password' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'mysql_old_password' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'mysql_native_password' 2015-11-11 09:05:14 6929 [Note] Shutting down plugin 'binlog' 2015-11-11 09:05:14 6929 [Note] /usr/sbin/mysqld: Shutdown complete 151111 09:05:14 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
Here's syslog:
Nov 11 08:48:21 localhost systemd[1]: Starting MySQL Community Server... Nov 11 08:48:21 localhost mysqld_safe[6403]: 151111 08:48:21 mysqld_safe Can't log to error log and syslog at the same time. Remove all --log-error configuration options for --syslog to take effect. Nov 11 08:48:21 localhost mysqld_safe[6403]: 151111 08:48:21 mysqld_safe Logging to '/var/log/mysql/error.log'. Nov 11 08:48:21 localhost mysqld_safe[6403]: 151111 08:48:21 mysqld_safe Starting mysqld daemon with databases from /var/lib/mysql Nov 11 08:48:21 localhost kernel: [ 4919.689076] audit: type=1400 audit(1447220901.895:21): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/usr/my.cnf" pid=6761 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=108 ouid=0 Nov 11 08:48:22 localhost systemd[1]: Started MySQL Community Server. Nov 11 08:55:33 localhost systemd[1]: session-16.scope: Cannot determine UID from slice user-0.slice Nov 11 08:55:33 localhost systemd[1]: Started Session 16 of user root. Nov 11 09:00:01 localhost CRON[6841]: (smmsp) CMD (test -x /etc/init.d/sendmail && test -x /usr/share/sendmail/sendmail && test -x /usr/lib/sm.bin/sendmail && /usr/share/sendmail/sendmail cron-msp) Nov 11 09:03:01 localhost systemd[1]: Started MySQL Community Server. Nov 11 09:05:14 localhost kernel: [ 5931.833511] php5-fpm invoked oom-killer: gfp_mask=0x201da, order=0, oom_score_adj=0 Nov 11 09:05:14 localhost kernel: [ 5931.833529] php5-fpm cpuset=/ mems_allowed=0 Nov 11 09:05:14 localhost kernel: [ 5931.833582] CPU: 0 PID: 6914 Comm: php5-fpm Not tainted 4.2.0-16-generic #19-Ubuntu Nov 11 09:05:14 localhost kernel: [ 5931.833589] Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 Nov 11 09:05:14 localhost kernel: [ 5931.833600] 0000000000000000 000000002c9946d9 ffff88000f5ff958 ffffffff817e8c09 Nov 11 09:05:14 localhost kernel: [ 5931.833609] 0000000000000000 ffff88001cf16e00 ffff88000f5ff9e8 ffffffff817e69ff Nov 11 09:05:14 localhost kernel: [ 5931.833613] ffffffff810c3d61 0000000000000000 0000000000000001 0000000000000000 Nov 11 09:05:14 localhost kernel: [ 5931.833616] Call Trace: Nov 11 09:05:14 localhost kernel: [ 5931.833674] [] dump_stack+0x45/0x57 Nov 11 09:05:14 localhost kernel: [ 5931.833682] [] dump_header+0x8c/0x214 Nov 11 09:05:14 localhost kernel: [ 5931.833716] [] ? __raw_callee_save___pv_queued_spin_unlock+0x11/0x20 Nov 11 09:05:14 localhost kernel: [ 5931.833739] [] oom_kill_process+0x1e1/0x3b0 Nov 11 09:05:14 localhost kernel: [ 5931.833744] [] out_of_memory+0x556/0x5b0 Nov 11 09:05:14 localhost kernel: [ 5931.833749] [] __alloc_pages_nodemask+0x8c1/0xa10 Nov 11 09:05:14 localhost kernel: [ 5931.833771] [] alloc_pages_current+0x91/0x100 Nov 11 09:05:14 localhost kernel: [ 5931.833776] [] __page_cache_alloc+0xa0/0xc0 Nov 11 09:05:14 localhost kernel: [ 5931.833780] [] filemap_fault+0x14a/0x3f0 Nov 11 09:05:14 localhost kernel: [ 5931.833790] [] __do_fault+0x50/0xe0 Nov 11 09:05:14 localhost kernel: [ 5931.833795] [] handle_mm_fault+0xf5b/0x17e0 Nov 11 09:05:14 localhost kernel: [ 5931.833804] [] ? __wake_up+0x48/0x60 Nov 11 09:05:14 localhost kernel: [ 5931.833809] [] ? __raw_callee_save___pv_queued_spin_unlock+0x11/0x20 Nov 11 09:05:14 localhost kernel: [ 5931.833826] [] __do_page_fault+0x197/0x400 Nov 11 09:05:14 localhost kernel: [ 5931.833831] [] trace_do_page_fault+0x37/0xa0 Nov 11 09:05:14 localhost kernel: [ 5931.833840] [] do_async_page_fault+0x19/0x70 Nov 11 09:05:14 localhost kernel: [ 5931.833848] [] async_page_fault+0x28/0x30 Nov 11 09:05:14 localhost kernel: [ 5931.833855] Mem-Info: Nov 11 09:05:14 localhost kernel: [ 5931.833865] active_anon:112864 inactive_anon:1012 isolated_anon:0 Nov 11 09:05:14 localhost kernel: [ 5931.833865] active_file:270 inactive_file:324 isolated_file:0 Nov 11 09:05:14 localhost kernel: [ 5931.833865] unevictable:0 dirty:0 writeback:0 unstable:0 Nov 11 09:05:14 localhost kernel: [ 5931.833865] slab_reclaimable:2725 slab_unreclaimable:2449 Nov 11 09:05:14 localhost kernel: [ 5931.833865] mapped:9930 shmem:16693 pagetables:1403 bounce:0 Nov 11 09:05:14 localhost kernel: [ 5931.833865] free:1156 free_pcp:30 free_cma:0 Nov 11 09:05:14 localhost kernel: [ 5931.833873] Node 0 DMA free:1972kB min:88kB low:108kB high:132kB active_anon:12808kB inactive_anon:60kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:15992kB managed:15908kB mlocked:0kB dirty:0kB writeback:0kB mapped:1260kB shmem:1660kB slab_reclaimable:252kB slab_unreclaimable:312kB kernel_stack:32kB pagetables:132kB unstable:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB writeback_tmp:0kB pages_scanned:0 all_unreclaimable? yes Nov 11 09:05:14 localhost kernel: [ 5931.833890] lowmem_reserve[]: 0 471 471 471 Nov 11 09:05:14 localhost kernel: [ 5931.833898] Node 0 DMA32 free:2652kB min:2732kB low:3412kB high:4096kB active_anon:438648kB inactive_anon:3988kB active_file:1080kB inactive_file:1296kB unevictable:0kB isolated(anon):0kB isolated(file):0kB present:507896kB managed:484772kB mlocked:0kB dirty:0kB writeback:0kB mapped:38460kB shmem:65112kB slab_reclaimable:10648kB slab_unreclaimable:9484kB kernel_stack:1680kB pagetables:5480kB unstable:0kB bounce:0kB free_pcp:120kB local_pcp:120kB free_cma:0kB writeback_tmp:0kB pages_scanned:16600 all_unreclaimable? yes Nov 11 09:05:14 localhost kernel: [ 5931.833906] lowmem_reserve[]: 0 0 0 0 Nov 11 09:05:14 localhost kernel: [ 5931.833910] Node 0 DMA: 17*4kB (UM) 6*8kB (UM) 4*16kB (U) 0*32kB 10*64kB (UM) 7*128kB (UEM) 1*256kB (M) 0*512kB 0*1024kB 0*2048kB 0*4096kB = 1972kB Nov 11 09:05:14 localhost kernel: [ 5931.833936] Node 0 DMA32: 205*4kB (UE) 161*8kB (E) 34*16kB (UE) 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 2652kB Nov 11 09:05:14 localhost kernel: [ 5931.833958] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=1048576kB Nov 11 09:05:14 localhost kernel: [ 5931.833960] Node 0 hugepages_total=0 hugepages_free=0 hugepages_surp=0 hugepages_size=2048kB Nov 11 09:05:14 localhost kernel: [ 5931.833962] 17296 total pagecache pages Nov 11 09:05:14 localhost kernel: [ 5931.833971] 0 pages in swap cache Nov 11 09:05:14 localhost kernel: [ 5931.833974] Swap cache stats: add 0, delete 0, find 0/0 Nov 11 09:05:14 localhost kernel: [ 5931.833976] Free swap = 0kB Nov 11 09:05:14 localhost kernel: [ 5931.833978] Total swap = 0kB Nov 11 09:05:14 localhost kernel: [ 5931.833981] 130972 pages RAM Nov 11 09:05:14 localhost kernel: [ 5931.833984] 0 pages HighMem/MovableOnly Nov 11 09:05:14 localhost kernel: [ 5931.833987] 5802 pages reserved Nov 11 09:05:14 localhost kernel: [ 5931.833989] 0 pages cma reserved Nov 11 09:05:14 localhost kernel: [ 5931.833991] 0 pages hwpoisoned Nov 11 09:05:14 localhost kernel: [ 5931.833994] [ pid ] uid tgid total_vm rss nr_ptes nr_pmds swapents oom_score_adj name Nov 11 09:05:14 localhost kernel: [ 5931.834004] [ 203] 0 203 31441 610 64 3 0 0 systemd-journal Nov 11 09:05:14 localhost kernel: [ 5931.834019] [ 210] 0 210 10965 164 21 3 0 -1000 systemd-udevd Nov 11 09:05:14 localhost kernel: [ 5931.834030] [ 498] 100 498 25075 65 20 3 0 0 systemd-timesyn Nov 11 09:05:14 localhost kernel: [ 5931.834036] [ 558] 104 558 64093 207 28 4 0 0 rsyslogd Nov 11 09:05:14 localhost kernel: [ 5931.834042] [ 565] 0 565 7135 76 18 3 0 0 systemd-logind Nov 11 09:05:14 localhost kernel: [ 5931.834047] [ 584] 105 584 10715 112 26 3 0 -900 dbus-daemon Nov 11 09:05:14 localhost kernel: [ 5931.834052] [ 604] 0 604 7599 69 20 3 0 0 cron Nov 11 09:05:14 localhost kernel: [ 5931.834058] [ 607] 0 607 71148 215 39 3 0 0 accounts-daemon Nov 11 09:05:14 localhost kernel: [ 5931.834062] [ 651] 0 651 6015 95 15 3 0 0 vsftpd Nov 11 09:05:14 localhost kernel: [ 5931.834068] [ 736] 0 736 62752 2266 78 4 0 0 php5-fpm Nov 11 09:05:14 localhost kernel: [ 5931.834073] [ 857] 0 857 26139 485 49 3 0 0 sendmail-mta Nov 11 09:05:14 localhost kernel: [ 5931.834079] [ 1143] 0 1143 17493 191 38 4 0 -1000 sshd Nov 11 09:05:14 localhost kernel: [ 5931.834082] [ 1148] 0 1148 4330 41 13 3 0 0 agetty Nov 11 09:05:14 localhost kernel: [ 5931.834085] [ 1161] 0 1161 58312 737 53 4 0 0 nginx Nov 11 09:05:14 localhost kernel: [ 5931.834088] [ 1168] 0 1168 9184 202 22 3 0 0 systemd Nov 11 09:05:14 localhost kernel: [ 5931.834091] [ 1169] 0 1169 14725 438 32 3 0 0 (sd-pam) Nov 11 09:05:14 localhost kernel: [ 5931.834094] [ 1192] 0 1192 24962 257 52 3 0 0 sshd Nov 11 09:05:14 localhost kernel: [ 5931.834097] [ 1210] 0 1210 5914 395 16 3 0 0 bash Nov 11 09:05:14 localhost kernel: [ 5931.834099] [ 1382] 1001 1382 58355 884 51 4 0 0 nginx Nov 11 09:05:14 localhost kernel: [ 5931.834103] [ 5879] 1001 5879 74907 22161 118 4 0 0 php5-fpm Nov 11 09:05:14 localhost kernel: [ 5931.834106] [ 6339] 1001 6339 75760 22995 117 4 0 0 php5-fpm Nov 11 09:05:14 localhost kernel: [ 5931.834109] [ 6341] 1001 6341 72891 20096 112 4 0 0 php5-fpm Nov 11 09:05:14 localhost kernel: [ 5931.834112] [ 6403] 108 6403 1119 39 8 3 0 0 mysqld_safe Nov 11 09:05:14 localhost kernel: [ 5931.834115] [ 6761] 108 6761 248107 29148 112 4 0 0 mysqld Nov 11 09:05:14 localhost kernel: [ 5931.834118] [ 6820] 0 6820 24962 270 52 3 0 0 sshd Nov 11 09:05:14 localhost kernel: [ 5931.834121] [ 6838] 0 6838 3216 61 12 3 0 0 sftp-server Nov 11 09:05:14 localhost kernel: [ 5931.834124] [ 6912] 1001 6912 75446 14104 98 4 0 0 php5-fpm Nov 11 09:05:14 localhost kernel: [ 5931.834126] [ 6914] 1001 6914 75006 13555 96 4 0 0 php5-fpm Nov 11 09:05:14 localhost kernel: [ 5931.834129] Out of memory: Kill process 6761 (mysqld) score 233 or sacrifice child Nov 11 09:05:14 localhost kernel: [ 5931.834552] Killed process 6761 (mysqld) total-vm:992428kB, anon-rss:116592kB, file-rss:0kB Nov 11 09:05:14 localhost mysqld_safe[6403]: 151111 09:05:14 mysqld_safe Number of processes running now: 0 Nov 11 09:05:14 localhost mysqld_safe[6403]: 151111 09:05:14 mysqld_safe mysqld restarted Nov 11 09:05:14 localhost kernel: [ 5931.983543] audit: type=1400 audit(1447221914.187:22): apparmor="DENIED" operation="open" profile="/usr/sbin/mysqld" name="/usr/my.cnf" pid=6929 comm="mysqld" requested_mask="r" denied_mask="r" fsuid=108 ouid=0 Nov 11 09:05:14 localhost mysqld_safe[6403]: 151111 09:05:14 mysqld_safe mysqld from pid file /var/run/mysqld/mysqld.pid ended
I' running ubuntu 15.10, mysql 5.6.27, nginx 1.9.6, PHP 5.6.11-1ubuntu3.1 (fpm-fcgi).
So, how to fix that?
And, being a newbie at mysql, I wonder why mysql is so fragile and can be so easily killed (and make the whole bunch of sites connected to it unavailable). How to make it more robust?
Best Answer
"Nov 11 09:05:14 localhost kernel: [ 5931.834129] Out of memory: Kill process 6761 (mysqld) score 233 or sacrifice child"
You are crossing system memory and then kernel is killing highest user of memory - in your case that'd be mysqld. Consider revising mysql global and per-thread variables in order to limit total usage under control. You may use this procedure to estimate MySQL memory usage or you might want to fill in here to check the usage details.
Also... Swapping is not good for MySQL, it's better to have swappiness set to 1-10 or 0 depending on your kernel version. Refer here.