Postgres 9.2 was happily replicating until I upgraded the server from CentOS 6.3 to 6.4. Log error shows
2013-05-06 23:51:35 EDT [19421]: [206-1] user=,db=,remote= LOG: archive command failed with exit code 14
2013-05-06 23:51:35 EDT [19421]: [207-1] user=,db=,remote= DETAIL: The failed archive command was: rsync --whole-file --ignore-existing --delete-after -a pg_xlog/000000010000006B00000016 backup:/archive/000000010000006B00000016
rsync: Failed to exec ssh: Permission denied (13)
rsync error: error in IPC code (code 14) at pipe.c(84) [sender=3.0.6]
rsync: connection unexpectedly closed (0 bytes received so far) [sender]
rsync error: error in IPC code (code 14) at io.c(600) [sender=3.0.6]
Foiled again by SELinux permissions:
type=AVC msg=audit(1367932037.676:10325): avc: denied { search } for pid=2567 comm="rsync" name="pgsql" dev=dm-0 ino=664822 scontext=unconfined_u:system_r:rsync_t:s0 tcontext=system_u:object_r:postgresql_db_t:s0 tclass=dir
type=SYSCALL msg=audit(1367932037.676:10325): arch=c000003e syscall=2 success=no exit=-13 a0=1ebd330 a1=0 a2=e a3=4 items=0 ppid=2433 pid=2567 auid=0 uid=26 gid=26 euid=26 suid=26 fsuid=26 egid=26 sgid=26 fsgid=26 tty=(none) ses=57 comm="rsync" exe="/usr/bin/rsync" subj=unconfined_u:system_r:rsync_t:s0 key=(null)
type=AVC msg=audit(1367932037.677:10326): avc: denied { execute } for pid=2568 comm="rsync" name="ssh" dev=dm-0 ino=266187 scontext=unconfined_u:system_r:rsync_t:s0 tcontext=system_u:object_r:ssh_exec_t:s0 tclass=file
type=SYSCALL msg=audit(1367932037.677:10326): arch=c000003e syscall=59 success=no exit=-13 a0=7fff1686fa27 a1=7fff1686fb60 a2=7fff16872d38 a3=7fff1686f860 items=0 ppid=2567 pid=2568 auid=0 uid=26 gid=26 euid=26 suid=26 fsuid=26 egid=26 sgid=26 fsgid=26 tty=(none) ses=57 comm="rsync" exe="/usr/bin/rsync" subj=unconfined_u:system_r:rsync_t:s0 key=(null)
I found there is a boolean for postgres and rsync and tried
setsebool -P postgresql_can_rsync 1
but replication still failed to work. There must be more required related to ssh and/or rsync. Anyone solved this (without just disabling SELinux)?
Thanks,
John DeSoi, Ph.D.
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