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April 25, 2018

apparmor=”DENIED” operation=”open” profile=”/usr/sbin/mysqld”

Filed under: Linux — Tags: , , — admin @ 12:07 pm

Today try to move the path of mysql to new one , because on ec2 I was left without space.

Well I have stopped the mysqld copy files modity the my.cnf with new datadir but when try to start .. well didn’t started .. After a little dmesg search see that on ubuntu is apparmor .

Try to make alias into file /etc/mysql/mysql.conf.d/mysqld.cnf  but didn’t resolve the problem

Find out that you have to edit also /etc/apparmor.d/usr.sbin.mysqld

and add

/db/data/mysql r

/db/data/mysql** rwk

After this mysqld started with new path.

December 8, 2017

delete large directory containing thousands of files

Filed under: Linux — Tags: , , , , , — admin @ 11:22 am

Well if you try to remove a directory with multiple files rm will take a long time also some load on that server .

One solution is to rsync a empty directory .

mkdir empty_dir
rsync -a –delete empty_dir/ yourdirectory/

Also a perl can be made but the rsync is easy for me to remeber .

Some more information about this you can find here

https://serverfault.com/questions/183821/rm-on-a-directory-with-millions-of-files/328305#328305

 

August 30, 2017

httpd with multiple ssl and password for every key automatically

Filed under: Linux — Tags: , , , , — admin @ 1:19 pm

Well to use this we must use the SSLPassPhraseDialog functionality of httpd – apache .

Basically into ssl.conf we put this line or modify the existing one into

SSLPassPhraseDialog exec:/path/script

Where script is read/execute only by root.

And the script is

 

#!/bin/perl
$server = $ARGV[0];
#print $server;
if ($server eq ‘www.example.com:443’ || $server eq ‘www.example2.com:443’ ) {
print ‘password one’;
} elsif ($server eq ‘example3.com’) {
print ‘Password two’;
}

 

September 22, 2015

centos /dev/md127 problem after reboot

Filed under: Linux — Tags: , , , , — admin @ 1:06 pm

Hello
Well today I want to explain about my raid experience.
I have to setup a hybrid server on hetzner. I setup the ssd on raid1 using installimage and those other hard drive I have create a raid from linux and mounted them on /raid1 directory .
However after reboot, my /dev/md4 disappear and a /dev/md127 appear.
To create the raid I have use this
fdisk /dev/sdc and /dev/sdd . Make a primary partition and set it up as fd software raid partition .

mdadm –create /dev/md4 –level=1 –raid-devices=2 /dev/sdc1 /dev/sdd1
mkfs.ext4 /dev/md4
mkdir /raid1
mount /dev/md4 /raid1

And insert this into fstab file
/dev/md4 /raid1 ext4 noatime,rw 0 0

So how to fix this ?
First I try to input some information into /etc/mdadm.conf but without luck . It appear that the linux read this late and the centos/ubuntu initalize this from initrd . So in order to fix this some steps have to be done .
After reboot try to fill the information into mdadm.conf with
ARRAY /dev/md/4 UUID=b3c33fe5:3b078681:e2776e37:4f9fd991
The UUID I have taken from

mdadm –detail /dev/md4

First unmount and stop the raid

mdadm –stop /dev/md127
After this assemble it again with your desire
mdadm –assemble /dev/md4 /dev/sdc1 /dev/sdd1

After this I have copy the
/boot/initramfs-2.6.32-573.3.1.el6.x86_64.img to a backup file ( initramfs-2.6.32-573.3.1.el6.x86_64.img-back ) in case something go wrong.

After this run
dracut –force

If is centos 5 or less you have to copy initrd file and to recreate use
mkinitrd -f -v /boot/initrd-$(uname -r).img $(uname -r)

On ubuntu you have to run
sudo update-initramfs -u

And restart the server.

December 16, 2014

Setting up HAProxy with SSL

Filed under: Linux — Tags: , , , , — admin @ 2:02 pm

Well today I was set up a haproxy to use ssl, and did’t figure out from first time how to get only one file for the pem.
In haproxy you have only one file with all certificates.

So the order is this:
cat matrafox.info.key >> matrafox.info.pem
cat matrafox.info.crt >> matrafox.info.pem
cat intermediate.bundle >> matrafox.info.pem

After this just add the
bind *:443 ssl crt /etc/ssl/matrafox.info.pem
And you will have the right one.

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