Solved: ndo2db: Could not bind socket: Address already in use.

In this post, we will see one of the common error message of ndo2db and its solution.

I. Error Message

[root@ngelinux01 ~]# /usr/local/nagios/bin/ndo2db -c /usr/local/nagios/etc/ndo2db.cfg -f
Could not bind socket: Address already in use
[root@ngelinux01 ~]#


II. Solution

A. Search for ndo.sock files on the system

[root@ngelinux01 ~]# find / -name ndo.sock
[root@ngelinux01 ~]#


B. Remove the socket file.

[root@ngelinux01 ~]# rm -rf /usr/local/nagios/var/ndo.sock
[root@ngelinux01 ~]#


C. Restart the ndo2db service now.

[root@ngelinux01 ~]# service ndo2db restart
Redirecting to /bin/systemctl restart ndo2db.service
[root@ngelinux01 ~]#

[root@ngelinux01 ~]# service ndo2db status
Redirecting to /bin/systemctl status ndo2db.service
● ndo2db.service - Nagios Data Out Daemon
Loaded: loaded (/usr/lib/systemd/system/ndo2db.service; enabled; vendor preset: disabled)
Active: active (running) since Tue 2023-09-05 20:55:30 PDT; 3s ago
Process: 42675 ExecStopPost=/bin/rm -f /usr/local/nagios/var/ (code=exited, status=0/SUCCESS)
Main PID: 43219 (ndo2db)
Tasks: 1 (limit: 102326)
Memory: 836.0K
CGroup: /system.slice/ndo2db.service
└─43219 /usr/local/nagios/bin/ndo2db -c /usr/local/nagios/etc/ndo2db.cfg -f

Sep 05 20:55:30 ngelinux01 systemd[1]: Started Nagios Data Out Daemon.
[root@ngelinux01 ~]#

As we can see above the service is now started and working fine as the socket is free now.

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