[Users] OOM and /etc/vz/oom-groups.conf

[Mark J.]

On Thu, Oct 03, 2013 at 10:41:41AM -0700, Kir Kolyshkin wrote:
> As you can see, there are both ram (physpages) and swap fails.
> There is nothing wrong with the current behaviour -- if all RAM
> and swap is gone, there is absolutely no other way than to kill
> some process.
> 
> So OOM killer configuration won't help here, you need to either
> decrease mysql appetites (/etc/my.cnf) or increase RAM or swap.
> Apparently my.cfg is not configured for a system with 2G of RAM
> (if you can show my.cnf we can see where it needs to be tuned),
> and this is the source of the problem and this is what needs to be
> fixed. It would be the same way on a real physical server, i.e.
> the problem is orthogonal to OpenVZ.
> 
> But the easiest way would be to increase swap for this container,
> and then check if swap failcounter is not increasing. If there will
> be enough ram+swap, there will be no OOM kills.
>

I'll look into increasing the swap on this one and see if it helps.

Here is the my.cnf file (comments stripped out) thats used in the cpanel VM's (and yes I could be missing a memory setting some where) some of the settings we set for prestashop usability:

[mysqld]
port            = 3306
socket          = /tmp/mysql.sock
key_buffer = 64M
max_allowed_packet = 32M
bulk_insert_buffer_size = 64M
table_open_cache = 32768
open_files_limit = 65536
sort_buffer_size = 8M
read_buffer_size = 2M
read_rnd_buffer_size = 4M
myisam_sort_buffer_size = 128M
myisam_max_sort_file_size = 10G
myisam_repair_threads = 2
thread_cache = 8
myisam_recover
query_cache_size= 256M
query_cache_limit = 2M
# Try number of CPU's*2 for thread_concurrency
thread_concurrency = 16
max_connections = 100
#max_user_connections = 40
max_delayed_threads = 0
log-error = /var/log/mysql.error.log
log-warnings
ft_min_word_len = 3
wait_timeout = 300
tmp_table_size = 512M
max_heap_table_size = 512M
table_definition_cache = 12000
join_buffer_size = 256K
userstat = 1 
server-id       = 1
innodb_data_home_dir = /var/lib/mysql/
innodb_log_group_home_dir = /var/lib/mysql/
innodb_buffer_pool_size = 64M
innodb_additional_mem_pool_size = 10M
innodb_log_file_size = 128M
innodb_log_buffer_size = 8M
innodb_log_files_in_group = 3
innodb_file_io_threads = 4
innodb_thread_concurrency = 4
innodb_max_dirty_pages_pct = 90
innodb_file_per_table = 1
[mysqldump]
quick
max_allowed_packet = 32M
[mysql]
no-auto-rehash
[isamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[myisamchk]
key_buffer = 128M
sort_buffer_size = 128M
read_buffer = 2M
write_buffer = 2M
[mysqlhotcopy]
interactive-timeout
[mysqld_safe]
open-files-limit = 8192
 
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