Linux Archives - Page 3 of 4

Posted June 18, 2018April 17, 20211 CommentPosted in Linux, NetworkingLinux, Networking

Ping all IPv6 Neighbors

ping6 can be used on Linux hosts to ping the “allhosts” address, ff02::1. If you try running ping6 ff02::1 with no arguments you will get an error like connect: Invalid argument, instead you must provide the interface to ping from with the -I argument. As an example, to ping all […]

Posted June 17, 2018April 17, 2021Leave a commentPosted in Desktop, Linux, ServerDesktop, Linux, Server

Common LVM Commands

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

Posted May 18, 2018April 17, 2021Leave a commentPosted in Linux, ServerLinux, Server

Common PostgreSQL Commands

These 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; […]

Posted April 1, 2018April 12, 2021Leave a commentPosted in Linux, ServerLinux, Server

SNMPD Configuration Template

Part 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: […]

Posted March 30, 2018April 17, 2021Leave a commentPosted in Linux, ServerLinux, Server

CentOS 7 Active Directory Authentication

To 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 […]

Posted March 30, 2018April 24, 2021Leave a commentPosted in Linux, ServerLinux, Server

CentOS 7 Dell Server Setup

CentOS 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 […]

Posted March 28, 2018April 17, 2021Leave a commentPosted in LinuxLinux

Common iproute2 Commands

These are some common commands for iproute2. VLAN’s Add VLAN 100 interface on eth0: ip link add link eth0 name eth0.100 type vlan id 100 Delete VLAN 100 interface on eth0: ip link delete eth0.100 Bring up the VLAN 100 interface: ip link set dev eth0.100 up Bring down the […]

Posted March 27, 2018April 17, 2021Leave a commentPosted in LinuxLinux

GNU Screen Tips

These are some common commands I use. In the examples, C-a means push the Control + A buttons at the same time. Send command to all windows Enter command line mode with C-a then :. This will send ls -l to all windows: Automatic window naming When I connect to […]

Posted March 27, 2018April 17, 2021Leave a commentPosted in LinuxLinux

Common OpenSSL Commands

These are some common OpenSSL commands. Generating Keys/Certs Generate new CSR and private key: openssl req -out csr.csr -new -sha256 -newkey rsa:4096 -nodes -keyout key.key Generate CSR for an existing key: openssl req -out csr.csr -key key.key -new -sha256 Generate self signed cert and key: openssl req -x509 -sha256 -nodes […]

Posted March 23, 2018April 17, 2021Leave a commentPosted in DesktopDesktop

Debian and Bluetooth Headphones

My default Debian install had an issue with the headphones not working. To resolve it I needed to install the pulse audio bluetooth module and restart the service: