Archive for the ‘ Tools ’ Category

AV1 codec

Learn how to instantly improve online viewing experience for your users by embracing the new AV1 video format that is already supported by Chrome and Firefox. This short guide will also show how to replace your GIF’s with videos, using AV1 or H.264, to make your files twenty to forty times smaller.

https://evilmartians.com/chronicles/better-web-video-with-av1-codec

2019
03/29
CATEGORY
Performance
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OVH Setup server hybrid second disk array

As OVH doesn’t provide a guide to install the second disk array, which is sold optionally, I will publish my solution.

Please be careful, only try these on test configurations and without any disks containing critical data. Some commands can destroy all of your data.

There seems to be soon a solution within the manager – but for now this isn’t working:

Tested on Ubuntu 14.04

Some commands to detect your actual configuration:

    fdisk -l
    lsblk -o NAME,SIZE,FSTYPE,TYPE,MOUNTPOINT
    df -h -x devtmpfs -x tmpfs

Delete sdb1/sda1 with parted:

    parted /dev/sdb
    (parted) print
    Model: ATA HGST HUS726040AL (scsi)
    Disk /dev/sdb: 4001GB
    Sector size (logical/physical): 512B/512B
    Partition Table: gpt
 
    Number  Start   End    Size   File system  Name     Flags
     1      1049kB  537MB  536MB               primary  boot
 
    (parted) rm 1
    (parted) quit
 
 
    parted /dev/sda
    (parted) print
    Model: ATA HGST HUS726040AL (scsi)
    Disk /dev/sda: 4001GB
    Sector size (logical/physical): 512B/512B
    Partition Table: gpt
 
    Number  Start   End    Size   File system  Name     Flags
     1      1049kB  537MB  536MB               primary  boot
 
    (parted) rm 1
    (parted) quit

Add new raid partition (needs to be done for sdb and sda):

    # Create raid 1 in live linux system
    parted -a optimal /dev/sdb
    # Place a flag gpt or mbr
    mklabel gpt
    # Create partition
    mkpart primary ext4 0% 100%
    # Mark partition as software raid partition
    set 1 raid on
    # Verify its alligned
    align-check
    optimal
    # Show results
    print
 
    # Create raid 1 in live linux system
    parted -a optimal /dev/sda
    # Place a flag gpt or mbr
    mklabel gpt
    # Create partition
    mkpart primary ext4 0% 100%
    # Mark partition as software raid partition
    set 1 raid on
    # Verify its alligned
    align-check
    optimal
    # Show results
    print

Create new raid configuration (‘level’ can be used for RAID0/1/5 …):

    mdadm --create --verbose /dev/md4 --level=0 --assume-clean --raid-devices=2 /dev/sdb1 /dev/sda1
    cat /proc/mdstat

In case of renaming:

    # Delete all and rescan
    mdadm -Ss
    mdadm --assemble --verbose /dev/md4 /dev/sdb1 /dev/sda1

Update mdadm configuration:

    # NOT NECCESSAIRE MAYBY USEFUL
    # mdadm --monitor --daemonise /dev/md4
 
    # Capture output
    mdadm --detail --scan
    # Something like: 'ARRAY /dev/md4 UUID=7d45838b:7886c766:5802452c:653f8cca'
    # Needs to be added to the end of file:
    /etc/mdadm/mdadm.conf
 
    # Update initramfs (ignore errors):
    update-initramfs -v -u
 
    # Create file system: 
    mkfs.ext4 -F /dev/md4
 
    # Mount fs:
    mount /dev/md4 /opt/
 
    # Update fstab:
    /etc/fstab
    /dev/md4 	/opt	ext4	defaults 	0	1

Could look something like that:

    lsblk
 
    NAME        MAJ:MIN RM   SIZE RO TYPE  MOUNTPOINT
    sdb           8:16   0   3.7T  0 disk
    `-sdb1        8:17   0   3.7T  0 part
      `-md4       9:4    0   7.3T  0 raid0 /opt
    nvme1n1     259:0    0 419.2G  0 disk
    |-nvme1n1p3 259:3    0   5.4G  0 part  [SWAP]
    |-nvme1n1p1 259:1    0   511M  0 part
    `-nvme1n1p2 259:2    0 413.3G  0 part
      `-md2       9:2    0 413.3G  0 raid1 /
    sda           8:0    0   3.7T  0 disk
    `-sda1        8:1    0   3.7T  0 part
      `-md4       9:4    0   7.3T  0 raid0 /opt
    nvme0n1     259:4    0 419.2G  0 disk
    |-nvme0n1p3 259:7    0   5.4G  0 part  [SWAP]
    |-nvme0n1p1 259:5    0   511M  0 part  /boot/efi
    `-nvme0n1p2 259:6    0 413.3G  0 part
      `-md2       9:2    0 413.3G  0 raid1 /

Now you can reboot the server and verify your configuration.

https://doc.ubuntu-fr.org/raid_logiciel
https://www.psylogical.org/node/198
https://www.digitalocean.com/community/tutorials/how-to-create-raid-arrays-with-mdadm-on-ubuntu-16-04
https://github.com/etalab/etalab-support/tree/master/procedures
https://docs.ovh.com/fr/dedicated/raid-soft/

2019
02/13
CATEGORY
Administration
Bash
Cloud
Lunix
Testing
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Installing Percona XtraDB Cluster 5.6 with Docker

This time I will be showing you how to setup a three-node Percona XtraDB Cluster (PXC) 5.6 on the Docker open-source engine. Just to review Docker… “is an open-source engine that automates the deployment of any application as a lightweight, portable, self-sufficient container that will run virtually anywhere.” In this case we will make use of a Dockerfile, think of this more like the Vagrantfile, it is a build script with a set of commands automating the creation of a new docker container. For this case,

Source: Installing Percona XtraDB Cluster 5.6 with Docker

2015
07/07
CATEGORY
Scaling
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