I have azure subscription, and build centos 7 vm. I'm installed apache, postgresql, and php laravel on top of it. For remote administration and file transfer i'm using ssh and sftp. But i got a problem. SSHD service suddenly closed in random time, for average one in 1.5 day. I checked the secure log, it shows:
i try to add swap partition, install telnet service for secondary remote, disable selinux and firewall, but no luck. The error message also seen on other services, like cron, postfix. But, the website (httpd) still working.Jun 28 23:50:43 HCIS-App sshd[5016]: Did not receive identification string from 172.30.18.10 port 34477
Jun 29 00:00:43 HCIS-App sshd[1198]: error: fork: Cannot allocate memory
Jun 29 00:10:43 HCIS-App sshd[1198]: error: fork: Cannot allocate memory
Jun 29 00:20:43 HCIS-App sshd[1198]: error: fork: Cannot allocate memory
Postfix
Jun 28 07:50:08 HCIS-App postfix/postfix-script[21501]: starting the Postfix mail system
Jun 28 07:50:08 HCIS-App postfix/master[21505]: daemon started -- version 2.10.1, configuration /etc/postfix
Jun 29 00:30:48 HCIS-App postfix/master[21505]: warning: master_spawn: fork: Cannot allocate memory -- throttling
Jun 29 00:31:48 HCIS-App postfix/master[21505]: warning: master_spawn: fork: Cannot allocate memory -- throttling
Jun 29 00:32:29 HCIS-App postfix/master[21505]: warning: unix_trigger_event: read timeout for service public/pickup
Jun 29 00:32:48 HCIS-App postfix/master[21505]: warning: master_spawn: fork: Cannot allocate memory -- throttling
Jun 29 00:33:48 HCIS-App postfix/master[21505]: warning: master_spawn: fork: Cannot allocate memory -- throttling
Cron
Jun 28 23:52:01 HCIS-App CROND[15165]: (hcisuser) CMD (php /var/www/html/hcconnQG/artisan schedule:run >> /dev/null 2>&1)
Jun 28 23:53:01 HCIS-App CROND[22174]: (hcisuser) CMD (php /var/www/html/hcconnQG/artisan schedule:run >> /dev/null 2>&1)
Jun 28 23:53:01 HCIS-App CROND[28456]: (root) CMD (/usr/lib64/sa/sa2 -A)
Jun 28 23:53:01 HCIS-App CROND[11524]: (CRON) CAN'T FORK (child_process): Cannot allocate memory
Jun 28 23:54:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:54:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:55:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:55:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:56:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:56:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:57:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:57:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:58:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:58:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:59:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 28 23:59:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 29 00:00:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
Jun 29 00:00:01 HCIS-App crond[19020]: (CRON) CAN'T FORK (do_command): Cannot allocate memory
------------------etc--------
httpd
[Sun Jun 28 03:14:02.172761 2020] [mpm_prefork:notice] [pid 1199] AH00163: Apache/2.4.6 (CentOS) PHP/7.0.33 configured -- resuming normal operations
[Sun Jun 28 03:14:02.172768 2020] [core:notice] [pid 1199] AH00094: Command line: '/usr/sbin/httpd -D FOREGROUND'
[Sun Jun 28 11:22:07.323874 2020] [cgi:error] [pid 31090] [client aaa.bbb.ccc.ddd:59666] script not found or unable to stat: /var/www/cgi-bin/mainfunction.cgi
[Sun Jun 28 13:19:50.245031 2020] [:error] [pid 11882] [client aaa.bbb.ccc.ddd:55412] script '/var/www/html/setup.php' not found or unable to stat
[Mon Jun 29 00:08:17.833962 2020] [mpm_prefork:error] [pid 1199] (12)Cannot allocate memory: AH00159: fork: Unable to fork new process
[Mon Jun 29 02:01:35.258657 2020] [:error] [pid 12368] [client aaa.bbb.ccc.ddd:53840] script '/var/www/html/index.php' not found or unable to stat
[Mon Jun 29 03:06:49.993991 2020] [cgi:error] [pid 15964] [client aaa.bbb.ccc.ddd:42317] script not found or unable to stat: /var/www/cgi-bin/mainfunction.cgi
[Mon Jun 29 03:06:56.919207 2020] [cgi:error] [pid 6717] [client aaa.bbb.ccc.ddd:42348] script not found or unable to stat: /var/www/cgi-bin/mainfunction.cgi
[Mon Jun 29 03:07:10.343073 2020] [cgi:error] [pid 5685] [client aaa.bbb.ccc.ddd:42379] script not found or unable to stat: /var/www/cgi-bin/mainfunction.cgi
[Mon Jun 29 05:04:17.019705 2020] [mpm_prefork:error] [pid 1199] (12)Cannot allocate memory: AH00159: fork: Unable to fork new process
[Mon Jun 29 05:08:53.304324 2020] [mpm_prefork:error] [pid 1199] (12)Cannot allocate memory: AH00159: fork: Unable to fork new process
[Mon Jun 29 05:14:29.648909 2020] [mpm_prefork:error] [pid 1199] (12)Cannot allocate memory: AH00159: fork: Unable to fork new process
[Mon Jun 29 05:36:47.059635 2020] [mpm_prefork:error] [pid 1199] (12)Cannot allocate memory: AH00159: fork: Unable to fork new process
[Mon Jun 29 05:41:05.320885 2020] [mpm_prefork:error] [pid 1199] (12)Cannot allocate memory: AH00159: fork: Unable to fork new process
[Mon Jun 29 05:51:55.920251 2020] [:error] [pid 6717] [client aaa.bbb.ccc.ddd:45158] script '/var/www/html/azenv.php' not found or unable to stat
[Mon Jun 29 05:54:47.186817 2020] [mpm_prefork:error] [pid 1199] (12)Cannot allocate memory: AH00159: fork: Unable to fork new process