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When starting keepalived with SNMP enabled, keepalived fails to connect as a subagent due to AVC for "/var/agentx/master" UNIX socket: # ausearch -m avc ---- time->Mon Dec 5 08:45:31 2016 type=SYSCALL msg=audit(1480949131.095:4863): arch=c000003e syscall=42 success=no exit=-13 a0=e a1=7ffcc02bf450 a2=6e a3=2 items=0 ppid=55438 pid=55440 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="keepalived" exe="/usr/sbin/keepalived" subj=system_u:system_r:keepalived_t:s0 key=(null) type=AVC msg=audit(1480949131.095:4863): avc: denied { connectto } for pid=55440 comm="keepalived" path="/var/agentx/master" scontext=system_u:system_r:keepalived_t:s0 tcontext=system_u:system_r:snmpd_t:s0 tclass=unix_stream_socket
Based on success=no exit=-13, the SELinux denial was caught in enforcing mode. Could you re-run the scenario in permissive mode and attach the resulting SELinux denials?
In permissive mode: type=SERVICE_START msg=audit(1480964036.515:5144): pid=1 uid=0 auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0 msg='unit=keepalived comm="systemd" exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success' type=AVC msg=audit(1480964036.521:5145): avc: denied { connectto } for pid=9017 comm="keepalived" path="/var/agentx/master" scontext=system_u:system_r:keepalived_t:s0 tcontext=system_u:system_r:snmpd_t:s0 tclass=unix_stream_socket type=SYSCALL msg=audit(1480964036.521:5145): arch=c000003e syscall=42 success=yes exit=0 a0=c a1=7ffc69316fe0 a2=6e a3=2 items=0 ppid=9016 pid=9017 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 egid=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="keepalived" exe="/usr/sbin/keepalived" subj=system_u:system_r:keepalived_t:s0 key=(null)
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://access.redhat.com/errata/RHBA-2018:0763