Re: [ovirt-users] HA agent fails to start

On 04/14/2016 02:14 PM, Simone Tiraboschi wrote: > On Thu, Apr 14, 2016 at 12:51 PM, Richard Neuboeck > <hawk(a)tbi.univie.ac.at&gt; wrote: >> On 04/13/2016 10:00 AM, Simone Tiraboschi wrote: >>> On Wed, Apr 13, 2016 at 9:38 AM, Richard Neuboeck <hawk(a)tbi.univie.ac.at&gt; wrote: >>>> The answers file shows the setup time of both machines. >>>> >>>> On both machines hosted-engine.conf got rotated right before I wrote >>>> this mail. Is it possible that I managed to interrupt the rotation with >>>> the reboot so the backup was accurate but the update not yet written to >>>> hosted-engine.conf? >>> >>> AFAIK we don't have any rotation mechanism for that file; something >>> else you have in place on that host? >> >> Those machines are all CentOS 7.2 minimal installs. The only >> adaptation I do is installing vim, removing postfix and installing >> exim, removing firewalld and installing iptables-service. Then I add >> the oVirt repos (3.6 and 3.6-snapshot) and deploy the host. >> >> But checking lsof shows that 'ovirt-ha-agent --no-daemon' has access >> to the config file (and the one ending with ~): >> >> # lsof | grep 'hosted-engine.conf~' >> ovirt-ha- 193446 vdsm 351u REG >> 253,0 1021 135070683 >> /etc/ovirt-hosted-engine/hosted-engine.conf~ > > This is not that much relevant if the file was renamed after > ovirt-ha-agent opened it. > Try this: > > [root@c72he20160405h1 ovirt-hosted-engine-setup]# tail -n1 -f > /etc/ovirt-hosted-engine/hosted-engine.conf & > [1] 28866 > [root@c72he20160405h1 ovirt-hosted-engine-setup]# port= > > [root@c72he20160405h1 ovirt-hosted-engine-setup]# lsof | grep hosted-engine.conf > tail 28866 root 3r REG > 253,0 1014 1595898 /etc/ovirt-hosted-engine/hosted-engine.conf > [root@c72he20160405h1 ovirt-hosted-engine-setup]# mv > /etc/ovirt-hosted-engine/hosted-engine.conf > /etc/ovirt-hosted-engine/hosted-engine.conf_123 > [root@c72he20160405h1 ovirt-hosted-engine-setup]# lsof | grep hosted-engine.conf > tail 28866 root 3r REG > 253,0 1014 1595898 > /etc/ovirt-hosted-engine/hosted-engine.conf_123 > [root@c72he20160405h1 ovirt-hosted-engine-setup]# > I've issued the commands you suggested but I don't know how that helps to find the process accessing the config files. After moving the hosted-engine.conf file the HA agent crashed logging the information that the config file is not available. Here is the output from every command: # tail -n1 -f /etc/ovirt-hosted-engine/hosted-engine.conf & [1] 167865 [root@cube-two ~]# port= # lsof | grep hosted-engine.conf ovirt-ha- 166609 vdsm 5u REG 253,0 1021 134433491 /etc/ovirt-hosted-engine/hosted-engine.conf (deleted) ovirt-ha- 166609 vdsm 7u REG 253,0 1021 134433453 /etc/ovirt-hosted-engine/hosted-engine.conf (deleted) ovirt-ha- 166609 vdsm 8u REG 253,0 1021 134433489 /etc/ovirt-hosted-engine/hosted-engine.conf (deleted) ovirt-ha- 166609 vdsm 9u REG 253,0 1021 134433493 /etc/ovirt-hosted-engine/hosted-engine.conf~ ovirt-ha- 166609 vdsm 10u REG 253,0 1021 134433495 /etc/ovirt-hosted-engine/hosted-engine.conf tail 167865 root 3r REG 253,0 1021 134433493 /etc/ovirt-hosted-engine/hosted-engine.conf~ # mv /etc/ovirt-hosted-engine/hosted-engine.conf /etc/ovirt-hosted-engine/hosted-engine.conf_123 # lsof | grep hosted-engine.conf ovirt-ha- 166609 vdsm 5u REG 253,0 1021 134433491 /etc/ovirt-hosted-engine/hosted-engine.conf (deleted) ovirt-ha- 166609 vdsm 7u REG 253,0 1021 134433453 /etc/ovirt-hosted-engine/hosted-engine.conf (deleted) ovirt-ha- 166609 vdsm 8u REG 253,0 1021 134433489 /etc/ovirt-hosted-engine/hosted-engine.conf (deleted) ovirt-ha- 166609 vdsm 9u REG 253,0 1021 134433493 /etc/ovirt-hosted-engine/hosted-engine.conf (deleted) ovirt-ha- 166609 vdsm 10u REG 253,0 1021 134433495 /etc/ovirt-hosted-engine/hosted-engine.conf (deleted) ovirt-ha- 166609 vdsm 12u REG 253,0 1021 134433498 /etc/ovirt-hosted-engine/hosted-engine.conf~ ovirt-ha- 166609 vdsm 13u REG 253,0 1021 134433499 /etc/ovirt-hosted-engine/hosted-engine.conf_123 tail 167865 root 3r REG 253,0 1021 134433493 /etc/ovirt-hosted-engine/hosted-engine.conf (deleted) > The issue is understanding who renames that file on your host. From what I've seen so far it looks like a child of vdsm accesses /etc/ovirt-hosted-engine/hosted-engine.conf periodically but is not responsible for the ~ file. # auditctl -w /etc/ovirt-hosted-engine/hosted-engine.conf and # auditctl -w /etc/ovirt-hosted-engine/hosted-engine.conf~ auditd.log shows this: type=SYSCALL msg=audit(1460639783.613:482590): arch=c000003e syscall=2 success=yes exit=75 a0=7f29b400f0b0 a1=0 a2=1b6 a3=24 items=1 ppid=1 pid=3701 auid=4294967295 uid=36 gid=36 euid=36 suid=36 fsuid=36 egid=36 sgid=36 fsgid=36 tty=(none) ses=4294967295 comm="jsonrpc.Executo" exe="/usr/bin/python2.7" subj=system_u:system_r:virtd_t:s0-s0:c0.c1023 key=(null) type=CWD msg=audit(1460639783.613:482590): cwd="/" type=PATH msg=audit(1460639783.613:482590): item=0 name="/etc/ovirt-hosted-engine/hosted-engine.conf" inode=134433499 dev=fd:00 mode=0100644 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:etc_t:s0 objtype=NORMAL Now that the HA agent is dead I'm removing the ~ file and starting the HA agent again. The ~ file immediately appears again. # rm hosted-engine.conf~ rm: remove regular file ‘hosted-engine.conf~’? y [root@cube-two ovirt-hosted-engine]# ls -l total 6800 -rw-r--r--. 1 root root 3252 Apr 8 10:35 answers.conf -rw-r--r--. 1 root root 6948582 Apr 14 14:48 ha-trace.log -rw-r--r--. 1 root root 1021 Apr 14 15:07 hosted-engine.conf -rw-r--r--. 1 root root 413 Apr 8 10:35 iptables.example [root@cube-two ovirt-hosted-engine]# systemctl start ovirt-ha-agent [root@cube-two ovirt-hosted-engine]# ls -l total 6804 -rw-r--r--. 1 root root 3252 Apr 8 10:35 answers.conf -rw-r--r--. 1 root root 6948582 Apr 14 14:48 ha-trace.log -rw-r--r--. 1 root root 1021 Apr 14 15:18 hosted-engine.conf -rw-r--r--. 1 root root 1021 Apr 14 15:07 hosted-engine.conf~ -rw-r--r--. 1 root root 413 Apr 8 10:35 iptables.example The auditd.log shows that ~ file is moved into place but not what issued the mv: type=CONFIG_CHANGE msg=audit(1460639919.277:482750): auid=4294967295 ses=4294967295 op="updated_rules" path="/etc/ovirt-hosted-engine/hosted-engine.conf~" key=(null) list=4 res=1 type=SYSCALL msg=audit(1460639919.277:482751): arch=c000003e syscall=82 success=yes exit=0 a0=7ffe4b3c0e90 a1=7ffe4b3bf920 a2=7f68083a2778 a3=7ffe4b3bf680 items=5 ppid=170233 pid=170234 auid=4294967295 uid=0 gid=0 euid=0 suid=0 fsuid=0 eg id=0 sgid=0 fsgid=0 tty=(none) ses=4294967295 comm="mv" exe="/usr/bin/mv" subj=system_u:system_r:unconfined_service_t:s0 key=(null) type=CWD msg=audit(1460639919.277:482751): cwd="/" type=PATH msg=audit(1460639919.277:482751): item=0 name="/etc/ovirt-hosted-engine/" inode=69555 dev=fd:00 mode=040755 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:etc_t:s0 objtype=PARENT type=PATH msg=audit(1460639919.277:482751): item=1 name="/etc/ovirt-hosted-engine/" inode=69555 dev=fd:00 mode=040755 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:etc_t:s0 objtype=PARENT type=PATH msg=audit(1460639919.277:482751): item=2 name="/etc/ovirt-hosted-engine/hosted-engine.conf" inode=134433453 dev=fd:00 mode=0100644 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:etc_t:s0 objtype=DELETE type=PATH msg=audit(1460639919.277:482751): item=3 name="/etc/ovirt-hosted-engine/hosted-engine.conf~" inode=134433499 dev=fd:00 mode=0100644 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:etc_t:s0 objtype=DELETE type=PATH msg=audit(1460639919.277:482751): item=4 name="/etc/ovirt-hosted-engine/hosted-engine.conf~" inode=134433453 dev=fd:00 mode=0100644 ouid=0 ogid=0 rdev=00:00 obj=system_u:object_r:etc_t:s0 objtype=CREATE > As a thumb rule, if a file name is appended with a tilde~, it only > means that it is a backup created by a text editor or similar program. If anyone except myself would have access to these systems I would guess the same. But since I'm not editing anything in /etc/ovirt-hosted-engine there must be another reason. And there is. Aside from auditd I tried to strace the whole thing just to make sure it comes from the HA agent. [root@cube-two ~]# strace -o ha-trace.log -f /usr/share/ovirt-hosted-engine-ha/ovirt-ha-agent --no-daemon Looking at the trace log I found this: 183409 statfs("/etc/ovirt-hosted-engine/.", {f_type=0x58465342, f_bsize=4096, f_blocks=13100800, f_bfree=12523576, f_bavail=12523576, f_files=52428800, f_ffree=52379892, f_fsid={64768, 0}, f_namelen=255, f_frsize=4096}) = 0 183409 rename("/etc/ovirt-hosted-engine/hosted-engine.conf", "/etc/ovirt-hosted-engine/hosted-engine.conf~") = 0 183409 rename("/var/lib/ovirt-hosted-engine-ha/tmpNjTElr", "/etc/ovirt-hosted-engine/hosted-engine.conf") = 0 183409 newfstatat(AT_FDCWD, "/etc/ovirt-hosted-engine/hosted-engine.conf", {st_mode=S_IFREG|0600, st_size=1021, ...}, AT_SYMLINK_NOFOLLOW) = 0 183409 open("/etc/ovirt-hosted-engine/hosted-engine.conf", O_RDONLY|O_NOFOLLOW) = 3 Putting it all together I started reading the HA agent sources and found the function _wrote_updated_conf_file in /usr/lib/python2.7/site-packages/ovirt_hosted_engine_ha/lib/upgrade.py which issues a mv -b which creates the ~ file.

The question now is why is this done so frequently. Especially considering since there are no modifications to the file. Is this behavior normal? [root@cube-two ~]# diff /etc/ovirt-hosted-engine/hosted-engine.conf* [root@cube-two ~]# >>>> [root@cube-two ~]# ls -l /etc/ovirt-hosted-engine >>>> total 16 >>>> -rw-r--r--. 1 root root 3252 Apr 8 10:35 answers.conf >>>> -rw-r--r--. 1 root root 1021 Apr 13 09:31 hosted-engine.conf >>>> -rw-r--r--. 1 root root 1021 Apr 13 09:30 hosted-engine.conf~ >>>> >>>> [root@cube-three ~]# ls -l /etc/ovirt-hosted-engine >>>> total 16 >>>> -rw-r--r--. 1 root root 3233 Apr 11 08:02 answers.conf >>>> -rw-r--r--. 1 root root 1002 Apr 13 09:31 hosted-engine.conf >>>> -rw-r--r--. 1 root root 1002 Apr 13 09:31 hosted-engine.conf~ >>>> >>>> On 12.04.16 16:01, Simone Tiraboschi wrote: >>>>> Everything seams fine here, >>>>> /etc/ovirt-hosted-engine/hosted-engine.conf seams to be correctly >>>>> created with the right name. >>>>> Can you please check the latest modification time of your >>>>> /etc/ovirt-hosted-engine/hosted-engine.conf~ and compare it with the >>>>> setup time? >>>>> >>>>> On Tue, Apr 12, 2016 at 2:34 PM, Richard Neuboeck <hawk(a)tbi.univie.ac.at&gt; wrote: >>>>>> On 04/12/2016 11:32 AM, Simone Tiraboschi wrote: >>>>>>> On Mon, Apr 11, 2016 at 8:11 AM, Richard Neuboeck <hawk(a)tbi.univie.ac.at&gt; wrote: >>>>>>>> Hi oVirt Group, >>>>>>>> >>>>>>>> in my attempts to get all aspects of oVirt 3.6 up and running I >>>>>>>> stumbled upon something I'm not sure how to fix: >>>>>>>> >>>>>>>> Initially I installed a hosted engine setup. After that I added >>>>>>>> another HA host (with hosted-engine --deploy). The host was >>>>>>>> registered in the Engine correctly and HA agent came up as expected. >>>>>>>> >>>>>>>> However if I reboot the second host (through the Engine UI or >>>>>>>> manually) HA agent fails to start. The reason seems to be that >>>>>>>> /etc/ovirt-hosted-engine/hosted-engine.conf is empty. The backup >>>>>>>> file ending with ~ exists though. >>>>>>> >>>>>>> Can you please attach hosted-engine-setup logs from your additional hosts? >>>>>>> AFAIK our code will never take a ~ ending backup of that file. >>>>>> >>>>>> ovirt-hosted-engine-setup logs from both additional hosts are >>>>>> attached to this mail. >>>>>> >>>>>>> >>>>>>>> Here are the log messages from the journal: >>>>>>>> Apr 11 07:29:39 cube-two.tbi.univie.ac.at systemd[1]: Starting oVirt >>>>>>>> Hosted Engine High Availability Monitoring Agent... >>>>>>>> Apr 11 07:29:39 cube-two.tbi.univie.ac.at ovirt-ha-agent[3747]: >>>>>>>> INFO:ovirt_hosted_engine_ha.agent.agent.Agent:ovirt-hosted-engine-ha >>>>>>>> agent 1.3.5.3-0.0.master started >>>>>>>> Apr 11 07:29:39 cube-two.tbi.univie.ac.at ovirt-ha-agent[3747]: >>>>>>>> INFO:ovirt_hosted_engine_ha.agent.hosted_engine.HostedEngine:Found >>>>>>>> certificate common name: cube-two.tbi.univie.ac.at >>>>>>>> Apr 11 07:29:39 cube-two.tbi.univie.ac.at ovirt-ha-agent[3747]: >>>>>>>> ovirt-ha-agent >>>>>>>> ovirt_hosted_engine_ha.agent.hosted_engine.HostedEngine ERROR Hosted >>>>>>>> Engine is not configured. Shutting down. >>>>>>>> Apr 11 07:29:39 cube-two.tbi.univie.ac.at ovirt-ha-agent[3747]: >>>>>>>> ERROR:ovirt_hosted_engine_ha.agent.hosted_engine.HostedEngine:Hosted >>>>>>>> Engine is not configured. Shutting down. >>>>>>>> Apr 11 07:29:39 cube-two.tbi.univie.ac.at ovirt-ha-agent[3747]: >>>>>>>> INFO:ovirt_hosted_engine_ha.agent.agent.Agent:Agent shutting down >>>>>>>> Apr 11 07:29:39 cube-two.tbi.univie.ac.at systemd[1]: >>>>>>>> ovirt-ha-agent.service: main process exited, code=exited, status=255/n/a >>>>>>>> >>>>>>>> If I restore the configuration from the backup file and manually >>>>>>>> restart the HA agent it's working properly. >>>>>>>> >>>>>>>> For testing purposes I added a third HA host which turn out to >>>>>>>> behave exactly the same. >>>>>>>> >>>>>>>> Any help would be appreciated! >>>>>>>> Thanks >>>>>>>> Cheers >>>>>>>> Richard >>>>>>>> >>>>>>>> -- >>>>>>>> /dev/null >>>>>>>> >>>>>>>> >>>>>>>> _______________________________________________ >>>>>>>> Users mailing list >>>>>>>> Users(a)ovirt.org >>>>>>>> http://lists.ovirt.org/mailman/listinfo/users >>>>>>>> >>>>>> >>>>>> >>>>>> -- >>>>>> /dev/null >>>> >>>> >>>> >>>> _______________________________________________ >>>> Users mailing list >>>> Users(a)ovirt.org >>>> http://lists.ovirt.org/mailman/listinfo/users >>>> >> >> >> -- >> /dev/null >> -- /dev/null