OK, this has just happened on my own server after an update from the server manager:
UNIT LOAD ACTIVE SUB DESCRIPTION
acpid.service loaded active running ACPI Event Daemon
atd.service loaded active running Job spooling tools
auditd.service loaded active running Security Auditing Service
blk-availability.service loaded active exited Availability of block device
clamd.service loaded active running clamd scanner () daemon
crond.service loaded active running Command Scheduler
cvm-unix.service loaded active running Credential Validation Module
dbus.service loaded active running D-Bus System Message Bus
dhcpd.service loaded active running DHCPv4 Server Daemon
dnscache.forwarder.service loaded active exited dnscache.forwarder,
dnscache.service loaded active exited dnscache,
dovecot.service loaded active running Dovecot IMAP/POP3 email serv
fail2ban.service loaded active running Fail2Ban Service
freshclam.service loaded active running ClamAV virus database update
getty@tty1.service loaded active running Getty on tty1
gssproxy.service loaded active running GSSAPI Proxy Daemon
httpd-admin.service loaded active running httpd-admin The Koozali SME
httpd-e-smith.service loaded active running httpd-e-smith The Koozali SM
irqbalance.service loaded active running irqbalance daemon
kmod-static-nodes.service loaded active exited Create list of required stat
ldap.init.service loaded active exited Koozali SME Server ldap.init
ldap.service loaded active running Koozali SME Server OpenLDAP
local.service loaded active exited Local service for Koozali SM
lpd.service loaded active exited lpd, LPRng print spool
lvm2-lvmetad.service loaded active running LVM2 metadata daemon
lvm2-monitor.service loaded active exited Monitoring of LVM2 mirrors,
lvm2-pvscan@9:1.service loaded active exited LVM2 PV scan on device 9:1
mariadb.service loaded active running MariaDB database server
masq.service loaded active exited masq, the Koozali SME Server
mdmonitor.service loaded active running Software RAID monitoring and
mysql.init.service loaded active exited Koozali SME Server mysql DB
networking.service loaded active exited Network management for Kooza
nmbd.service loaded active running nmbd.service
ntpd.service loaded active running Network Time Service
php-fpm.service loaded active running The PHP FastCGI Process Mana
php55-php-fpm.service loaded active running The PHP FastCGI Process Mana
php56-php-fpm.service loaded active running The PHP FastCGI Process Mana
php70-php-fpm.service loaded active running The PHP FastCGI Process Mana
php71-php-fpm.service loaded active running The PHP FastCGI Process Mana
php72-php-fpm.service loaded active running The PHP FastCGI Process Mana
php73-php-fpm.service loaded active running The PHP FastCGI Process Mana
php74-php-fpm.service loaded active running The PHP FastCGI Process Mana
php80-php-fpm.service loaded active running The PHP FastCGI Process Mana
php81-php-fpm.service loaded active running The PHP FastCGI Process Mana
qmail.service loaded active exited qmail, message transfer agen
qpsmtpd.service loaded active exited qpsmtpd
radiusd.service loaded active running FreeRADIUS high performance
rc-local.service loaded active exited /etc/rc.d/rc.local Compatibi
rhel-dmesg.service loaded active exited Dump dmesg to /var/log/dmesg
rhel-domainname.service loaded active exited Read and set NIS domainname
rhel-loadmodules.service loaded active exited Load legacy module configura
rhel-readonly.service loaded active exited Configure read-only root sup
rsyslog.service loaded active running System Logging Service
runit.service loaded active running Process Supervising Daemon
smartd.service loaded active running Self Monitoring and Reportin
smb.service loaded active exited Samba SMB Daemon global serv
smbd.service loaded active running Samba SMB Daemon
smtp-auth-proxy.service loaded active running Koozali SME Server SMTP auth
spamassassin.service loaded active running Spamassassin daemon
sqpsmtpd.service loaded active exited sqpsmtpd
● squid.service loaded failed failed Squid caching proxy
sshd.service loaded active running OpenSSH server daemon
systemd-journal-flush.service loaded active exited Flush Journal to Persisten
systemd-journald.service loaded active running Journal Service
systemd-logind.service loaded active running Login Service
systemd-random-seed.service loaded active exited Load/Save Random Seed
systemd-readahead-collect.service loaded active exited Collect Read-Ahead Dat
systemd-readahead-replay.service loaded active exited Replay Read-Ahead Data
[root@botham ~]# systemctl start squid
Job for squid.service failed because the control process exited with error code. See "systemctl status squid.service" and "journalctl -xe" for details.
I then ran journalctl -xe, and got:
Apr 19 13:01:19 botham.blackfingernail.co.uk systemd[1]: Unit squid.service entered failed state.
Apr 19 13:01:19 botham.blackfingernail.co.uk systemd[1]: squid.service failed.
Apr 19 13:02:58 botham.blackfingernail.co.uk ntpd[967]: 0.0.0.0 0613 03 spike_detect -0.403493 s
lines 2407-2429/2429 (END)
Apr 19 13:00:46 botham.blackfingernail.co.uk fail2ban-server[5019]: Server ready
Apr 19 13:01:01 botham.blackfingernail.co.uk crond[5057]: pam_unix(crond:session): session opened for user root by (uid=0)
Apr 19 13:01:01 botham.blackfingernail.co.uk CROND[5058]: (root) CMD (run-parts /etc/cron.hourly)
Apr 19 13:01:01 botham.blackfingernail.co.uk CROND[5057]: pam_unix(crond:session): session closed for user root
Apr 19 13:01:19 botham.blackfingernail.co.uk systemd[1]: Starting Squid caching proxy...
-- Subject: Unit squid.service has begun start-up
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit squid.service has begun starting up.
Apr 19 13:01:19 botham.blackfingernail.co.uk squid[5105]: squid: ERROR: Could not send signal 15 to process 2270: (1) Operation
Apr 19 13:01:19 botham.blackfingernail.co.uk systemd[1]: squid.service: control process exited, code=exited status=1
Apr 19 13:01:19 botham.blackfingernail.co.uk systemd[1]: Failed to start Squid caching proxy.
-- Subject: Unit squid.service has failed
-- Defined-By: systemd
-- Support: http://lists.freedesktop.org/mailman/listinfo/systemd-devel
--
-- Unit squid.service has failed.
--
-- The result is failed.
Based on what I did last time on the other server, I went to /var/log/squid and looked for a squid.pid file:
[root@botham ~]# cd /var/log/squid
[root@botham squid]# ls -l
total 10388
-rw-r----- 1 squid squid 1394149 Apr 19 12:55 access.log
-rw-r----- 1 squid squid 4596767 Mar 20 03:34 access.log-20220320.gz
-rw-r----- 1 squid squid 512879 Mar 27 03:19 access.log-20220327.gz
-rw-r----- 1 squid squid 2210238 Apr 3 03:21 access.log-20220403.gz
-rw-r----- 1 squid squid 704405 Apr 10 03:27 access.log-20220410.gz
-rw-r----- 1 squid squid 1102692 Apr 17 03:05 access.log-20220417.gz
-rw-r----- 1 squid squid 14625 Apr 19 13:01 cache.log
-rw-r----- 1 squid squid 14487 Mar 20 01:35 cache.log-20220320.gz
-rw-r----- 1 squid squid 15707 Mar 27 03:19 cache.log-20220327.gz
-rw-r----- 1 squid squid 6766 Apr 3 02:46 cache.log-20220403.gz
-rw-r----- 1 squid squid 13266 Apr 9 18:59 cache.log-20220410.gz
-rw-r----- 1 squid squid 1804 Apr 17 02:54 cache.log-20220417.gz
-rw------- 1 root root 112 Jan 29 12:54 squid.log-20220130.gz
-rw------- 1 root root 113 Feb 8 10:42 squid.log-20220209.gz
-rw------- 1 root root 137 Mar 4 10:08 squid.log-20220305.gz
-rw------- 1 root root 113 Mar 23 09:03 squid.log-20220324.gz
-rw------- 1 root root 113 Apr 12 07:56 squid.log-20220413.gz
-rw-r--r-- 1 root squid 5 Apr 12 07:56 squid.pid
I ran the command rm squid.pid, and then restarted squid with no problems.
Now, I'm also having problems with dovecot not starting up after an update, and also fail2ban. I know there have been problems with fail2ban, and I only have the problem with dovecot on my own machine.
I'm busy this afternoon, but will raise a bug as soon as I get the time. You'll all have to bear with me though, as things are a bit hectic at the moment. Sorry.