I had an issue, that the mail server always crashes. after investigations i found out, that it is a system memory issue. server had 8GB Ram and i've increased it to 16GB. it is now much better but still consuming too much memory.
following is top processes in my server:
top
top - 15:36:40 up 7:58, 1 user, load average: 91.59, 92.19, 91.31
Tasks: 455 total, 92 running, 306 sleeping, 0 stopped, 0 zombie
%Cpu(s): 96.4 us, 1.0 sy, 0.0 ni, 0.0 id, 0.0 wa, 0.0 hi, 0.0 si, 2.6 st
KiB Mem : 16424716 total, 2802776 free, 12251708 used, 1370232 buff/cache
KiB Swap: 924356 total, 924356 free, 0 used. 3784484 avail Mem
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
964 clamav 20 0 1645784 1.273g 32748 S 0.0 8.1 4:18.12 clamd
1553 gdm 20 0 4443620 208048 95508 S 0.0 1.3 2:05.02 gnome-shell
3413 amavis 20 0 356716 154252 9072 S 0.0 0.9 0:07.12 /usr/sbin/amavi
3040 amavis 20 0 347712 149016 11156 S 0.0 0.9 0:08.39 /usr/sbin/amavi
5892 root 20 0 370164 136068 25584 S 0.0 0.8 2:13.00 python
4493 root 20 0 370336 135972 25132 S 0.0 0.8 2:13.02 python
8301 root 20 0 368636 134792 25836 S 0.0 0.8 2:00.70 python
7144 root 20 0 368792 134440 25144 S 0.0 0.8 2:07.06 python
9649 root 20 0 368120 134328 25884 S 0.0 0.8 1:56.14 python
10783 root 20 0 367268 133152 25420 S 0.0 0.8 1:53.38 python
13154 root 20 0 367348 132748 25648 S 0.0 0.8 1:36.12 python
11919 root 20 0 366560 132388 25444 S 0.0 0.8 1:43.54 python
14346 root 20 0 367096 131868 25016 S 2.6 0.8 1:31.55 python
19062 root 20 0 366328 131736 25652 S 0.3 0.8 1:19.97 python
16717 root 20 0 365796 131604 25420 S 0.0 0.8 1:24.49 python
17853 root 20 0 365536 131392 25472 S 0.0 0.8 1:21.33 python
15498 root 20 0 365796 131320 25140 S 0.0 0.8 1:29.81 python
20243 root 20 0 365284 131140 25460 S 0.0 0.8 1:19.88 python
279 root 19 -1 242048 130968 126460 S 0.3 0.8 1:15.33 systemd-journal
26318 root 20 0 364768 130960 25788 S 0.0 0.8 1:09.60 python
32401 root 20 0 365308 130912 25832 S 0.0 0.8 0:59.69 python
22580 root 20 0 366072 130868 25036 S 0.3 0.8 1:08.76 python
21384 root 20 0 365020 130852 25444 S 0.0 0.8 1:17.45 python
27530 root 20 0 364512 130736 25824 S 0.0 0.8 1:07.66 python
28671 root 20 0 364508 130684 25772 S 0.0 0.8 1:04.15 python
29843 root 20 0 364512 130672 25756 S 0.0 0.8 0:59.03 python
25090 root 20 0 364768 130492 25320 S 0.0 0.8 1:05.57 python
23942 root 20 0 364768 130296 25132 S 0.0 0.8 1:12.47 python
7924 root 20 0 365060 130240 25404 S 0.3 0.8 0:50.47 python
9111 root 20 0 364788 130236 25668 S 0.0 0.8 0:48.10 python
22928 root 20 0 364536 130160 25836 S 0.0 0.8 0:43.47 python
31206 root 20 0 364256 130100 25460 S 0.3 0.8 0:59.90 python
12915 root 20 0 364796 130000 25420 S 0.0 0.8 0:47.30 python
21741 root 20 0 364536 129984 25656 S 0.0 0.8 0:43.85 python
6738 root 20 0 364004 129976 25852 S 0.0 0.8 0:51.10 python
30436 root 20 0 364284 129956 25876 S 0.0 0.8 0:39.76 python
4116 root 20 0 363588 129940 25824 S 0.0 0.8 0:58.51 python
26669 root 20 0 364280 129936 25856 S 0.0 0.8 0:39.85 python
25399 root 20 0 364280 129884 25808 S 0.0 0.8 0:42.84 python
2866 root 20 0 364000 129864 25744 S 0.0 0.8 0:58.40 python
1283 root 20 0 364256 129836 25460 S 0.0 0.8 0:57.17 python
29214 root 20 0 364276 129736 25656 S 0.0 0.8 0:39.39 python
12123 root 20 0 364024 129712 25844 S 0.0 0.8 0:17.65 python
32542 root 20 0 364032 129708 25840 S 0.0 0.8 0:22.26 python
16486 root 20 0 364536 129640 25316 S 0.0 0.8 0:48.89 python
29915 root 20 0 364024 129516 25656 S 0.3 0.8 0:22.66 python
5311 root 20 0 364000 129508 25388 S 0.0 0.8 0:54.04 python
9457 root 20 0 364020 129484 25620 S 0.0 0.8 0:17.12 python
22049 root 20 0 364024 129480 25604 S 0.0 0.8 0:11.85 python
20229 root 20 0 363488 129400 25776 S 0.0 0.8 0:42.52 python
27892 root 20 0 363228 129324 25840 S 0.0 0.8 0:39.54 python
11732 root 20 0 363744 129308 25428 S 0.0 0.8 0:46.03 python
15344 root 20 0 363748 129284 25400 S 0.0 0.8 0:45.86 python
14216 root 20 0 363740 129184 25320 S 0.0 0.8 0:46.72 python
Also postgredSql reachs max_connections and then closes because of too many requests from postfix.
Following is the log file of mail:
Feb 18 14:17:19 mail postfix/smtp[29560]: D3D5E2466DA: to=<[email protected]>, relay=none, delay=0.11, delays=0.1/0.01/0/0, dsn=5.4.6, status=bounced (mail for mail.MyDomain.de loops back to myself)
Feb 18 14:17:19 mail postfix/qmgr[3350]: D3D5E2466DA: removed
Feb 18 14:18:14 mail dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=80.144.15.182, lip=173.212.211.113, mpid=7829, TLS, session=<OAIlQ/n05+pQkA+2>
Feb 18 14:18:18 mail dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=80.144.15.182, lip=173.212.211.113, mpid=7849, TLS, session=<bwdWQ/n06OpQkA+2>
Feb 18 14:18:20 mail dovecot: imap-login: Login: user=<[email protected]>, method=PLAIN, rip=80.144.15.182, lip=173.212.211.113, mpid=7870, TLS, session=<3kR5Q/n06+pQkA+2>
Feb 18 14:18:20 mail postfix/pickup[6431]: 4D4DD246690: uid=132 from=<opendkim>
Feb 18 14:18:20 mail postfix/cleanup[2707]: 4D4DD246690: message-id=<[email protected]>
Feb 18 14:18:20 mail opendkim[1289]: 4D4DD246690: no signing table match for '[email protected]'
Feb 18 14:18:20 mail opendkim[1289]: 4D4DD246690: no signature data
Feb 18 14:18:20 mail postfix/qmgr[3350]: 4D4DD246690: from=<[email protected]>, size=1286, nrcpt=1 (queue active)
Feb 18 14:18:21 mail postfix/pickup[6431]: 67DEC246691: uid=0 from=<root>
Feb 18 14:18:21 mail postfix/cleanup[5432]: 67DEC246691: message-id=<[email protected]>
Feb 18 14:18:21 mail opendkim[1289]: 67DEC246691: no signing table match for '[email protected]'
Feb 18 14:18:21 mail opendkim[1289]: 67DEC246691: no signature data
Feb 18 14:18:21 mail postfix/pickup[6431]: B5152246696: uid=1005 from=<vmail>
Feb 18 14:18:21 mail postfix/cleanup[32236]: B5152246696: message-id=<[email protected]>
Feb 18 14:18:23 mail opendkim[1289]: B5152246696: no signing table match for '[email protected]'
Feb 18 14:18:23 mail opendkim[1289]: B5152246696: no signature data
Feb 18 14:18:25 mail postfix/qmgr[3350]: B5152246696: from=<[email protected]>, size=1261, nrcpt=1 (queue active)
Feb 18 14:18:26 mail postfix/qmgr[3350]: 67DEC246691: from=<[email protected]>, size=1241, nrcpt=1 (queue active)
Feb 18 14:18:27 mail postfix/smtp[27388]: 4D4DD246690: to=<[email protected]>, orig_to=<opendkim>, relay=none, delay=6.7, delays=0.3/6.4/0.08/0, dsn=5.4.6, status=bounced (mail for mail.MyDomain.de loops back to myself)
Feb 18 14:18:27 mail postfix/smtp[29560]: B5152246696: to=<[email protected]>, orig_to=<vmail>, relay=none, delay=5.3, delays=3.4/1.9/0/0, dsn=5.4.6, status=bounced (mail for mail.MyDomain.de loops back to myself)
Feb 18 14:18:27 mail postfix/smtp[27388]: 67DEC246691: to=<[email protected]>, orig_to=<root>, relay=none, delay=5.7, delays=5.6/0.08/0/0, dsn=5.4.6, status=bounced (mail for mail.MyDomain.de loops back to myself)
Feb 18 14:18:27 mail postfix/cleanup[2707]: 23AE42466F3: message-id=<[email protected]>
Feb 18 14:18:27 mail postfix/cleanup[32236]: 397BB24670C: message-id=<[email protected]>
Feb 18 14:18:27 mail postfix/bounce[7904]: 67DEC246691: sender non-delivery notification: 397BB24670C
Feb 18 14:18:27 mail postfix/qmgr[3350]: 397BB24670C: from=<>, size=3318, nrcpt=1 (queue active)
Feb 18 14:18:27 mail postfix/bounce[7903]: B5152246696: sender non-delivery notification: 23AE42466F3
Feb 18 14:18:27 mail postfix/qmgr[3350]: 67DEC246691: removed
Feb 18 14:18:27 mail postfix/qmgr[3350]: B5152246696: removed
Feb 18 14:18:27 mail postfix/qmgr[3350]: 23AE42466F3: from=<>, size=3345, nrcpt=1 (queue active)
Feb 18 14:18:27 mail postfix/smtp[29560]: 397BB24670C: to=<[email protected]>, relay=none, delay=0.81, delays=0.1/0.7/0/0, dsn=5.4.6, status=bounced (mail for mail.MyDomain.de loops back to myself)
Feb 18 14:18:27 mail postfix/smtp[27388]: 23AE42466F3: to=<[email protected]>, relay=none, delay=0.81, delays=0.8/0.01/0/0, dsn=5.4.6, status=bounced (mail for mail.MyDomain.de loops back to myself)
Feb 18 14:18:27 mail postfix/qmgr[3350]: 397BB24670C: removed
Feb 18 14:18:27 mail postfix/qmgr[3350]: 23AE42466F3: removed
Feb 18 14:18:28 mail postfix/cleanup[5432]: 0C3EC2466A0: message-id=<[email protected]>
Feb 18 14:18:28 mail postfix/bounce[3449]: 4D4DD246690: sender non-delivery notification: 0C3EC2466A0
Feb 18 14:18:28 mail postfix/qmgr[3350]: 0C3EC2466A0: from=<>, size=3391, nrcpt=1 (queue active)
Feb 18 14:18:28 mail postfix/qmgr[3350]: 4D4DD246690: removed
Feb 18 14:18:28 mail postfix/smtp[7902]: 0C3EC2466A0: to=<[email protected]>, relay=none, delay=1.4, delays=1.3/0.09/0.01/0, dsn=5.4.6, status=bounced (mail for mail.MyDomain.de loops back to myself)
Feb 18 14:18:28 mail postfix/qmgr[3350]: 0C3EC2466A0: removed
Feb 18 14:19:14 mail postfix/pickup[6431]: AFA9B246690: uid=132 from=<opendkim>
Feb 18 14:19:14 mail postfix/cleanup[2707]: AFA9B246690: message-id=<[email protected]>
Feb 18 14:19:14 mail opendkim[1289]: AFA9B246690: no signing table match for '[email protected]'
Feb 18 14:19:14 mail opendkim[1289]: AFA9B246690: no signature data
Feb 18 14:19:14 mail postfix/qmgr[3350]: AFA9B246690: from=<[email protected]>, size=6085, nrcpt=1 (queue active)
Feb 18 14:19:14 mail postfix/pickup[6431]: C90C5246691: uid=1005 from=<vmail>
Feb 18 14:19:14 mail postfix/cleanup[32236]: C90C5246691: message-id=<[email protected]>
Feb 18 14:19:14 mail opendkim[1289]: C90C5246691: no signing table match for '[email protected]'
Feb 18 14:19:14 mail opendkim[1289]: C90C5246691: no signature data
Feb 18 14:19:14 mail postfix/proxymap[7906]: warning: connect to pgsql server 127.0.0.1: FATAL: remaining connection slots are reserved for non-replication superuser connections?
Feb 18 14:19:14 mail postfix/trivial-rewrite[5409]: warning: virtual_alias_domains: proxy:pgsql:/etc/postfix/sql-domain-aliases.cf: table lookup problem
Feb 18 14:19:14 mail postfix/trivial-rewrite[5409]: warning: virtual_alias_domains lookup failure
as you see, the mail to [email protected] and from [email protected] and to [email protected] are keep running, even in times we did't do anything.
I suppose they are the reason. Is this normal? how can i stop them? As you see the postgredSql is stoped because of them and now the mail server not reachable any more.
I don't know how to handle this or it is just normal. i would be glad for any help!
