Netrack reports some statistics for the Top SSL Issuers, and it’s nice to see Let’s Encrypt leading the race with a significant advantage over the rest. Well done, ladies and gentlemen!
Category: Sysadmin
System administration is a special are of IT. It also has a special place in my heart. It is an interesting mixture of all the other disciplines, both common across the whole industry, and at the same time unique for each person, company, and geographical location. When I have something to say or share about system administration, I use this category.
MySQL optimize, repair, and analyze
Years ago I had the following script running as a cron job, but then I lost it somewhere. It took me a few minutes to find it again, but just in case I need it in the future, I’m saving it here.
#!/bin/bash mysqlcheck --all-databases mysqlcheck --all-databases -o mysqlcheck --all-databases --auto-repair mysqlcheck --all-databases --analyze
Found it here this time.
Nginx Performance Tuning – Tips & Tricks
Here are a whole lot of “Performance Tuning – Tips & Tricks” directly from the Nginx team. I’m sure you’ve seen bits and pieces of these all over the place, but it’s nice to have them all together and from the credible source as well.
PHP-FPM tuning: Using ‘pm static’ for Max Performance
“PHP-FPM tuning: Using ‘pm static’ for Max Performance” looks at different process management settings in PHP-FPM: static, dynamic, and ondemand, and the way they affect performance. The default – ondemand – might work well for you if you have a large server with plenty of resources and not so many actual visitors. Running on a smaller instance, or expecting high spikes of traffic might require you to look into your PHP-FPM configuration and adjust it. The article is just what the doctor ordered.
Personally, I prefer having a dedicated instance for the web server, but that instance being as small as possible. With that, figuring out the correct settings for static process management is easier. It also minimizes all those nasty cases of running out of memory, swapping, and having an excessive CPU utilization. Which is especially useful when running on Amazon AWS instances.
Change SQL mode for MariaDB in Fedora 27
After I upgraded my laptop to Fedora 27, I started experiencing some weird issues with most of the projects I am developing locally. Trying to save anything into the database that involves dates, started throwing the following errors:
Error: SQLSTATE[22007]: Invalid datetime format: 1292 Incorrect datetime value: '2017-11-30T13:30:48+02:00' for column 'timestamp' at row 1
A quick look around showed that Fedora 27 ships MariaDB v10.2, while the previous distribution version shipped MariaDB v10.1. Digging through the changes between the two versions didn’t help much, even though there is slight mention of the related change.
SQL_MODE has been changed; in particular, NOT NULL fields with no default will no longer fall back to a dummy value for inserts which do not specify a value for that field.
StackOverflow is much more helpful, as always. These two threads – one and two – in particular, explained the changes and suggested the fix. I had to either fix the projects I was working on, or modify my local configuration to use the old SQL mode. This thread provided some more details, so the final solution was adding the following to the /etc/my.cnf and restarting the MariaDB service:
[mysqld] sql-mode="NO_ZERO_IN_DATE,NO_ZERO_DATE"
And now we are back to normal.