lefred's blog


There Are 10 Types of People in the World....

pre-FOSDEM MySQL Day 2019

For the third year in a row, we will take advantage of the mass presence of our MySQL Engineers during FOSDEM to organize the pre-FOSDEM MySQL Day. The program of this 3rd edition is already on track, thank you to all the speakers who already confirmed their participation. Start End Event Speaker Company Topic Friday 1st February 09:30 10:00 MySQL … Read More


MySQL InnoDB Cluster: Automated Installation with Puppet

We saw yesterday that the new MySQL Shell was out and how we could create a MySQL InnoDB Cluster manually using the Shell. Today, I would like to show you how easy it is to create recipes to automate all the process. I have created a Puppet module that can be used as Proof-of-concept (You might need more features to … Read More


Vagrant environment to test MySQL Group Replication 0.8

Vadim Tkachenko recently released  Docker images for Group Replication (thank you for that 😉 ). As not everybody is already using Docker or just because having multiple choices is also nice (this is an OpenSource world isn’t it ?), I decided to share a Vagrant environment that you can use to evaluate Group Replication. This environment provides also a module that … Read More


CentOS 6 very slow with Vagrant

I use Vagrant to test almost everything. But since I upgraded to VirtuabBox 4.2.x and CentOS 6 as guess OS, I had the impression that everything was slower… and I get use to it…

But this week-end while preparing selinux policies for Percona XtraDB Cluster, I noticed that it was really slow…. really really very very slooooow :’-(

And I found the reason ! I first tried to add some kernel parameters like :

noacpi noapic divider=10 notsc

But that didn’t help.

Then I just enabled IO APIC on the VM’s configuration and it worked much faster ! The boot of the machine was faster and in my case loading selinux policies too !

Have a look to the difference:

Without IO APIC:

[root@node2 ~]# time semodule -i percona-xtradb-cluster-full.pp real 6m3.646s user 1m34.430s sys 3m42.805s

With IO APIC:

[root@node2 ~]# time semodule -i percona-xtradb-cluster-full.pp real 0m14.611s user 0m13.829s sys 0m0.769s

To enable IO APIC from Vagrant, these are the parameters to use in your Vagrantfile:

config.vm.customize ["modifyvm", :id, "--memory", "256", "--ioapic", "on"]


old Chinese proverb… beginning of devops ?

I read this today :

“If we have each one egg and we exchange them, we still each have one egg. If we have each one idea and we exchange these ideas, each of us will have two ideas”

… that’s #devops isn’t it ?


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