Networking, system administration and more
Networking, system administration and more
These are some common commands that are used when managing LVM devices. Volume Groups Create a volume group: vgcreate vg0 /dev/sda3 [/dev/sdb /dev/sdc /dev/sdd …] Logical Volumes Create a LV: lvcreate -n LV-NAME -L 30G VG-NAME Delete a LV: lvremove -n LV-NAME VG-NAME
Read moreThese are some common PostgreSQL commands for things that I need to remember. Opening session This assumes linux authentication (default for Debian Linux). Run the psql command as the postgres user: Open a database with \c DBNAME: Showing Table Info Use \dt to show table information (same as show tables; […]
Read morePart of a standard server setup for me includes installing SNMPD for remote monitoring of hosts. A simple SNMPD configuration template can be found below. You will need to change these variables: COM_NAME: This should be the community name that your SNMP poller users when connecting to the host. PREFIX: […]
Read moreTo configure CentOS 7 to use Active Directory as an authentication source sssd will be used. The sssd setup is greatly simplified using realmd, only basic manual configuration has to be added. Install Packages Install the required packages with yum: Join to Domain Join the host to the domain with […]
Read moreCentOS servers are supported by the Dell Linux software repository. Adding the repository will let you install and keep up to date things like the Dell iDRAC Service Module as well as Dell OMSA. Yum Repository First run the bootstrap script that Dell provides on the Dell EMC System Update […]
Read moreThe following settings should be used on Linux devices with a SSD. The instructions are Debian specific and taken from the SSDOptimization page on the Debian wiki. Automatic Trim/Mount Options Make sure the file system(s) are mounted with these options: discard,noatime,defaults As an example: Scheduler Set the scheduler for the […]
Read moreI upgraded a Debian Squeeze server to Wheezy recently which was running iSCSI with a Windows 7 initiator. When I started writing to the iSCSI device it would drop out and the server would show an oops message on screen like this: iscsi_trgt: BUG at /var/lib/dkms/iscsitarget/1.4.20.2/build/kernel/iscsi.c:392 assert(req->tio) In /var/log/messages the […]
Read moreAfter upgrading some load balancers to Debian Wheezy I noticed this error (happens when dpkg-reconfigure ipvsadm) is ran: If you encounter this error you can run this sed command to fix up the template:
Read more