Description of problem:
sssd silently fails to start if /etc/resolv.conf does not exist. This happens
even if /etc/nsswitch.conf doesn't include dns for the hosts map at all.
Version-Release number of selected component (if applicable):
sssd-1.5.1-66.el6_2.3.x86_64
How reproducible:
always
Steps to Reproduce:
1. rm -f /etc/resolv.conf
2. sed -i "s,dns,,g" /etc/nsswitch.conf
3. service sssd restart
Actual results:
[root@l2-node01 ~]# service sssd restart
Stopping sssd:                                             [  OK  ]
Starting sssd:                                             [  OK  ]
[root@l2-node01 ~]# ps xaw | grep sssd
12869 pts/0    S+     0:00 grep sssd
Expected results:
[root@l2-node01 ~]# service sssd restart
Stopping sssd:                                             [  OK  ]
Starting sssd:                                             [  OK  ]
[root@l2-node01 ~]# ps xaw | grep sssd
12885 ?        Ss     0:00 /usr/sbin/sssd -f -D
12887 ?        S      0:00 /usr/libexec/sssd/sssd_be -d 0 --debug-to-files
--domain default
12888 ?        S      0:00 /usr/libexec/sssd/sssd_nss -d 0 --debug-to-files
12889 ?        S      0:00 /usr/libexec/sssd/sssd_pam -d 0 --debug-to-files
12891 pts/0    S+     0:00 grep sssd
Additional info:
debug log shows what's going on: sssd tries to monitor /etc/resolv.conf for
changes because of its internal resolver:
[root@l2-node01 ~]# sssd -d 10 -i
(Fri Jun  8 10:04:29 2012) [sssd] [ldb] (6): server_sort:Unable to register
control with rootdse!
(Fri Jun  8 10:04:29 2012) [sssd] [confdb_get_domain_internal] (1): No
enumeration for [default]!
(Fri Jun  8 10:04:29 2012) [sssd] [ldb] (6): server_sort:Unable to register
control with rootdse!
(Fri Jun  8 10:04:29 2012) [sssd] [server_setup] (3): CONFDB:
/var/lib/sss/db/config.ldb
(Fri Jun  8 10:04:29 2012) [sssd] [monitor_config_file] (0): Could not stat
file [/etc/resolv.conf]. Error [2:No such file or directory]
Workaround is to create an empty /etc/resolv.conf.