Trouble after upgrading to 2.1 agent

Troubleshooting
12

I too had problems after upgrading to 2.1 agent (Checkmk Raw Edition 2.1.0)
Systemd Service Summary Total: 153, Disabled: 2, Failed: 2, 2 services failed (cmk-agent-ctl-daemon, systemd-networkd-wait-online)**CRIT**
tls enabled but not being used
registration OK
but port 6556 in use

root@ssfdb1:/tmp#  ss -tulpn | grep 6556
tcp     LISTEN   0        4096                   *:6556                 *:*      users:(("**systemd**",pid=1,fd=82))

root@ssfdb1:/tmp# systemctl start cmk-agent-ctl-daemon.service
root@ssfdb1:/tmp# tail -f /var/log/syslog
May 31 05:04:05 hostname_redacted systemd[1]: Stopped Checkmk agent controller daemon.
May 31 05:04:05 hostname_redacted systemd[1]: Started Checkmk agent controller daemon.
May 31 05:04:06 hostname_redacted cmk-agent-ctl[22636]: ERROR [cmk_agent_ctl] **Address in use** (os error 98)

Fixed by

apt purge check-mk-agent
apt install ./check-mk-agent_2.1.0-1_all.deb

root@ssfdb1:/tmp# ss -tulpn | grep 6556
tcp     LISTEN   0        4096                   *:6556                 *:*      users:(("**cmk-agent-ctl**",pid=27176,fd=9))                                       
root@ssfdb1:/tmp#

Phew
That was painful
Thanks Timdebruijn
Julian

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