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March 5, 2019

The impact of enabling MySQL sync_binlog – really high disk IO

MySQL

If you enable this feature in your MySQL you could increase your disk IO time and write by 8-10x times. Generally, this feature could save…

neoX
March 4, 2019

Upgrade MySQL 5.6 to 5.7 what problems to expect with old my.cnf configuration file

MySQL

Finally, we do not have any more MySQL 5.6 servers. We upgraded our last part of the system with MySQL 5.6 to 5.7. In our…

neoX
March 1, 2019

Tune nginx proxy cache – control the cache manager how to delete cached files

nginx, tips

In most cases you’ll never want to modify the default settings for deleting cache items with proxy_cache_path directives. The problem is in a peak the…

neoX
February 26, 2019

how to disable effectively the deleting (purging) files from nginx proxy_cache (nginx cache manager process)

nginx, tips

In peaks deleting files could kill your server and easily the traffic could degraded multiple times than normal if the nginx cache manager start deleting…

neoX
February 26, 2019

Check whether nginx cache manager is deleting files at the moment

nginx, tips

Here is a tip for the webmasters (or system admins) to discover whether the nginx using proxy_cache to cache files is deleting files at the…

neoX
February 20, 2019

mysql – Error ‘Your password does not satisfy the current policy requirements’ or zero length mysql password

Linux, MySQL, tips

We got this error when granting permissions for one of our new slave server (it could be for an ordinary MySQL server, too): It appeared…

neoX
February 19, 2019

mysql – Error ‘Column count of mysql.user is wrong. Expected 45, found 43. The table is probably corrupted’ on query.

Linux, MySQL, tips

If you upgraded your MySQL server (from 5.6 to 5.7 or above) or imported a MySQL dump SQL file from older version than your current…

neoX
January 23, 2019

pycurl.h: fatal error: openssl/ssl.h: No such file or directory

compiling, openssl, Ubuntu

If you encounter this error trying to install a pip module or compile a program under the console you surely miss OpenSSL development packages! pip…

neoX
January 20, 2019

New Redis server (4.0.9) in Ubuntu 16.04 LTS

redis, Ubuntu

One of our critical service was under Ubuntu 16.04 LTS (and is scheduled for update, but this a another story!) and how it always happens…

neoX
January 20, 2019

Replication hangs with Relay_Master_Log_File mysql-bin.999999 -wrong variables in mariadb (MySQL) show slave status

MySQL

Several days after another .999999 hang out – mariadb (MySQL) stopped flushing relay-bin log after mysqld-relay-bin.999999, the monitoring of one of the slaves got critical…

neoX

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