Publishes a new blog post about Redis installation

_posts/2019-01-25-some-redis-installation-notes.md

@@ -0,0 +1,89 @@
+---
+title: "Some Redis installation notes"
+date: 2019-01-25
+url: some-redis-installation-notes
+layout: post
+category: Tutorials
+image: /img/blog/some-redis-installation-notes.png
+description: "A blog post with a full and viable Redis installation procedure on Debian"
+---
+
+[![A missing blog post image](/img/blog/some-redis-installation-notes.png)](/img/blog/some-redis-installation-notes.png)
+
+### Introduction
+
+I've just achieved one more Redis installation today, and as the previous ones, I had to browse the WEB again, looking for the same pieces of information.  
+You'll find below my Redis-installation-memo (at least for me, in the future).
+
+No slow listening TCP sockets. Only a hardened UNIX one.  
+No boot warnings. Only Linux kernel tweaks.  
+No hand-made BASH scripts for standalone program administration. Only a systemd-supervised instance.
+
+> A Debian-sponsored procedure.
+
+### The procedure
+
+{% highlight bash %}
+aptitude install -y redis-server
+
+systemctl stop redis-server.service
+
+nano /etc/redis/redis.conf
+: '
+# ...
+port 0
+# ...
+tcp-backlog 128
+# ...
+unixsocket /var/run/redis/redis.sock
+unixsocketperm 770
+# ...
+supervised systemd
+# ...
+requirepass <at-least-a-64-byte-long-random-string>
+'
+
+sysctl -w vm.overcommit_memory=1
+echo -e '\n\n# REDIS\nvm.overcommit_memory = 1' >> /etc/sysctl.d/99-sysctl.conf
+
+systemctl edit --full redis-server.service
+: '
+# ...
+
+[Service]
+Type=notify
+# ...
+ExecStartPre=/bin/echo "never" > /sys/kernel/mm/transparent_hugepage/enabled
+
+# ...
+'
+
+systemctl daemon-reload
+systemctl start redis-server.service
+{% endhighlight %}
+
+At this time the server should be up and running, you may want to check that everything went fine this way :
+
+{% highlight bash %}
+tail /var/log/redis/redis-server.log
+{% endhighlight %}
+
+---
+
+For Redis usage from PHP-based applications you'll need :
+
+{% highlight bash %}
+usermod -a -G redis www-data
+
+# Using `mod_php` ?
+systemctl restart apache2
+
+# Using FPM ? 
+systemctl restart php7.X-fpm
+{% endhighlight %}
+
+---
+
+### Conclusion
+
+No conclusion. It should work, even for you, young WEB-wanderer.