In case you encounter this error with mysql and your docker-compose setup:
Unknown MySQL server host <mysql-service-name>
Code language:HTML, XML(xml)
… and you dont know why because everything seems to be correct.
Then you might have an upgrade problem with mysql because you are reusing an old volume that was created for another mysql version. This can happen when you use a unspecified tag as mysql:latest (not recommended anyway) and there was a version bump in the official mysql image. Or you upgraded the mysql container yourself, f.e. from mysql:5.6 to mysql:5.7 and you are reusing the data volume with the mysql files.
Recently i wanted to use Sqlite with Adminer in Docker and it turned out to be not so easy. I actually thought i could just declare Adminer in a docker-compose.yml file with a volume mounted, similar as i would do for adminer with mysql.
But since Adminer is a popular hacking target they introduced a feature that does not allow to run adminer without a password, out of the box. Sqlite database usually runs without password and dang, workaround needed!
Using MongoDB in your Silex Project is quite easy.
I will show this with my Superleansilexplate and will integrate it there as an example.
Since i dont want to integrate MongoDB in Superleansilexplate it will just become an additional gist.
Given you have some smaller amount of data like a counter that needs to be stored or other loose coupled datasets, we simply speak to MongoDB “directly” and store the data via Doctrine MongoDB Abstraction Layer.
Since i presume the Data / Document Structure isnt that complex we dont use Doctrine MongoDB ODM (the Object Document Mapper).
If you want to use it instead, try this Silex Extensions.
Recently i ran into RAM troubles on my vserver for some reasons, i encountered the evil:
Cannot allocate memory at ...
So first i suspected mongodb to use up loads of memory as top showed.
But after some recherche work i learned mongodb only -seems- to use a lot of memory.
see here and here and here
The actual usage was around 20mb RAM, so mongodb was innocent.
The true RAM monsters were some apache and php-fpm zombies, but thats another story.
While suspecting mongodb i thought about outsourcing the mongodb and i found a free and sufficient offer in mongolab.
My interests were on and i gave it a try.
The free version has a limit for up to 240MB storage and since my app is just a small counter it should last for some time. Continue reading “Migrate to Mongolab”
Augenscheinlich unterstützt das Security-Module nur die Authentifizierung via Benutzername und Password. Wie man sich mit einem Benutzernamen ODER der E-Mail-Adresse und einem Password authentifiziert, ist ein wenig versteckt. So gehts:
Will man mit PHP und MongoDB soetwas wie “SQL Aggregate Functions” umsetzen muss man sich etwas verbiegen.
MongoDb hat zwar eine group() function, die in etwa SQLs GROUP BY entspricht, allerdings kann man dies nicht kombinieren mit SORT oder LIMIT bzw den sort() und limit() Funktionen, da diese keinen Cursor zurückgibt sondern direkt ein Array.
Will man also sortieren und limitieren muss man sich des Map / Reduce features von MongoDB bedienen.
Ich mag schnoddrig-nerdige Blogposts mit (s/f)uck im Titel, daher heute mal der hier: 10 Tips For Optimizing MySQL Queries That Don’t Suck. Sicher nicht brandaktuell, doch Leiderprobte (“Warum dauert der §()!”% das so lange?”) möchten sicher hin und wieder daran erinnert werden.