Technical guides and operational notes filed under Centos.
Technical guides and operational notes filed under Centos.
Open LiteSpeed is an open source web server which comes with a lot of interesting features that helps us to manage our sites effectively. Some of the features include 1) Page Caching – which improves the loading time of…
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Bad Magic Number In Superblock The Server will go down due to issues in disks attached. Sometimes fsck in disks ends up in an error “Bad magic number in Superblock while trying to open /dev/sdb”. What do you mean by…
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Log in via SSH and Update your Server First, you will need to log in to your CentOS 8 VPS by using SSH as the root user: ssh root@IP_ADDRESS -p PORT_NUMBER Replace IP_ADRRESS and PORT_NUMBER with the correct server IP…
Read Article![An operation fails in Plesk: SQLSTATE[23000]: Integrity constraint violation: 1062 Duplicate entry 'X' for key 'PRIMARY'](/blog/uploads/2020/05/plesk-windows.jpeg)
Symptoms When adding a customer, subscription, mail account, mailing list, IP address, changing domain hosting type or installing a Let's Encrypt SSL certificate in Plesk, the operation fails with one of the following…
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Mozilla announced their ‘mozjpeg’ project with the aim of improving lossless jpeg compression and making the web a faster place. Forked from libjpeg-turbo, mozjpeg is more concerned with reducing filesize than doing it…
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RAID Levels RAID 0 Stripes data evenly across two or more disks. RAID 1 Mirrors data on two or more disks. RAID 2 Rarely used, Bit-level striping with Hamming code for error correction. RAID 3 Rarely used, byte-level…
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Mdadm is the modern tool most Linux distributions use these days to manage software RAID arrays; in the past raidtools was the tool we have used for this. This cheat sheet will show the most common usages of mdadm to…
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Using dnf you can search for available wireless drivers in the RHEL 8 / CentOS 8 repositories. The built-in way If your wireless card has not been detected automatically by the RHEL 8 / CentOS 8 kernel you can search…
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First Check the NIC driver version installed on the server. [root@test]# /sbin/lspci | grep Ethernet 0b:00.0 Ethernet controller: Intel Corporation 82574L Gigabit Network Connection 15:00.0 Ethernet controller: Intel…
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If you use Arch Linux and its derivatives like Antergos or Manjaro Linux, you can easily find how long have you been without a reinstall by analyzing the pacman logs as shown below. head -n1 /var/log/pacman.log On…
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