On 17/02/16 14:32, Michael H wrote:
> Hi, re-posting this with a more appropriate subject for my reply;
>
>> The easy answer is yes .. glibc requires so many things to be restarted,
>> that is the best bet. Or certainly the easiest.
>>
>> Note: in CentOS 7, there is also a kernel update which is rated as
>> Important .. so you should boot to that anyway:
>> https://lists.centos.org/pipermail/centos-announce/2016-February/021705.html
>>
>> Here is a good link to figure out what to restart if you don't want to
>> reboot:
>>
>> https://rwmj.wordpress.com/2014/07/10/which-services-need-restarting-after-an-upgrade/
>>
>> and there is this thread:
>> http://markmail.org/message/dodinyrhwgey35mh
>>
>> But generalyl, after a glibc update or a kernel update .. rebooting is
>> easiest and it ensures everything is protected.
>
> Wow, so, I updated my server (yum update -y) which applied a new kernel
> and the new glibc among other things, After the update completed it
> knocked my master postgresql database offline.
>
>
> Feb 17 13:46:11 db1 systemd: Starting PostgreSQL database server...
> Feb 17 13:46:11 db1 pg_ctl: LOG: invalid value for parameter
> "max_stack_depth": 16384
> Feb 17 13:46:11 db1 pg_ctl: DETAIL: "max_stack_depth" must not exceed
> 7680kB.
> Feb 17 13:46:11 db1 pg_ctl: HINT: Increase the platform's stack depth
> limit via "ulimit -s" or local equivalent.
> Feb 17 13:46:11 db1 pg_ctl: FATAL: configuration file
> "/var/lib/pgsql/data/postgresql.conf" contains errors
> Feb 17 13:46:16 db1 pg_ctl: pg_ctl: could not start server
> Feb 17 13:46:16 db1 pg_ctl: Examine the log output.
> Feb 17 13:46:16 db1 systemd: postgresql.service: control process exited,
> code=exited status=1
> Feb 17 13:46:16 db1 systemd: Failed to start PostgreSQL database server.
> Feb 17 13:46:16 db1 systemd: Unit postgresql.service entered failed state.
> Feb 17 13:46:16 db1 systemd: postgresql.service failed.
>
>
> I have kernel parameters specified in /etc/sysctl.conf
>
> vm.swappiness=0
> vm.overcommit_memory=2
> vm.overcommit_ratio=90
> kernel.shmmax=35433480192
> kernel.shmall=8650752
>
> After the update my postgresql service could not start because these
> parameters had been reset, I promptly rebooted to server to re-apply them.
>
> Has something changed?!? after a reboot the service still complained
> that my max_stack_depth was too high because kernel shmmax and shmall
> were too low with the same error shown above.
>
> [root@db1 ~]# ulimit -a
> core file size (blocks, -c) 0
> data seg size (kbytes, -d) unlimited
> scheduling priority (-e) 0
> file size (blocks, -f) unlimited
> pending signals (-i) 514616
> max locked memory (kbytes, -l) 64
> max memory size (kbytes, -m) unlimited
> open files (-n) 1024
> pipe size (512 bytes, -p) 8
> POSIX message queues (bytes, -q) 819200
> real-time priority (-r) 0
> stack size (kbytes, -s) 8192
> cpu time (seconds, -t) unlimited
> max user processes (-u) 514616
> virtual memory (kbytes, -v) unlimited
> file locks (-x) unlimited
>
> confirms that my entries in /etc/sysctl.conf were ignored.
>
> Why would these not work anymore?
>
> Are the parameters specified elsewhere now?
>
> any information would be very helpful!
Some additional information;
sysctl -a | grep kernel.shm
kernel.shmall = 8650752
kernel.shmmax = 35433480192
kernel.shmmni = 4096
which corresponds to my /etc/sysctl.conf
kernel.shmmax=35433480192
kernel.shmall=8650752
but contradicts;
ulimit -a
[...]
stack size (kbytes, -s) 8192
[...]
Any suggestions as to why this has happened?
thanks
Michael
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