Category Linux

Linux: migrate storage with pvmove

1. Begin by pvcreate’ing the new disk. This is the disk from the new storage array to which we want to migrate to. # pvcreate /dev/mapper/mpathY 2. Now, add this disk into the data_vg Volume Group : # vgextend data_vg…

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Systemd: automatically restart after failure

With systemd you can configure the service so that it automaticaly restarts the service in case the service crashes.It’s enough to add the “restart” option to the [service] stanza within the service systemd configuraiton file.See example below. Of course, you…

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Clamav: limit memory usage

Once in a while the clamd process can get killed because of memory usage. It turns out it would always get killed when reloading the database after an update. This is due to the fact that during a database reload clamd will…

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Linux: GRUB slow on 4k screens

In case you have a screen with high resolutions, a 4k screen for example, it is possible that GRUB is incredibly slow. If that is the case, the workaround is to edit the /etc/default/grub file, and add/replace the following line…

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Linux – commvault: create systemd file

If you have upgraded your old Commvault agent,or you still use an old Commvault agent on your linux ‘systemd’ system, there won’t be any start/stop script for the agent. You can use the workaround below for creating a systemd file…

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Fail2ban: unblock an ip

Find IP Address to Unblock Log in to your server via SSH and type in the following command: iptables -L -n Look for the IP address you want to unblock / unban. Now we must find the jail name this…

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Fail2ban: whitelist an ip

First, edit the config file : vi Then, check the line : ignoreip = Add now add all ip you want. Each IP or range IP must be placed here with a space. Ex: 192.168.0.1 192.168.5.0/32 Save. And restart…

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