Category: gnu/linux

  • configure docker host with remote api on your linux machine

    step 1: install docker engine. follow steps for your os from the docker documentation here – step 2: assuming that you’re using ubuntu, open the file docker.service located at the path /lib/systemd/system/docker.service step 3: search for the line which says ExecStart. by default it should have something like this ExecStart=/usr/bin/dockerd -H fd:// –containerd=/run/containerd/containerd.sock . […]

  • list all versions of an available package using yum/dnf

    dnf list <packagename> –showduplicates Example: [ec2-user@ip-172-31-39-90 ~]$ sudo dnf list kmod-kvdo –showduplicates Updating Subscription Management repositories. Unable to read consumer identity This system is not registered to Red Hat Subscription Management. You can use subscription-manager to register. Last metadata expiration check: 0:04:00 ago on Thu 03 Jun 2021 23:54:45 UTC. Available Packages kmod-kvdo.x86_64 rhel-8-baseos-rhui-rpms […]

  • autofs mounts

    autofs is a nice traditional way to mount the nfs directories on-demand on the nfs clients. was originally used to mount the user home directories to the clients to make them sort of roaming user profiles, but this doesnt stop us from using it to configure nfs mounts in other ways. using autofs saves unnecessary […]

  • selinux prevents mounted directories for serving content for httpd

    error message (13)Permission denied: [client <ipaddress>:<port>] AH00035: access to /index.html denied (filesystem path ‘/opt/rh/httpd24/root/var/www/html/index.html’) because search permissions are missing on a component of the path fix run this on the host directory serving the content chcon  –user system_u –type httpd_sys_content_t -Rv <dir> if you’ve worked with selinux before, you will realise that chcon is a temporary […]

  • setup and use nfs server on rhel 8

    default nfs version in rhel 8 is version 4 install nfs-server dnf -y install nfs-server nfs-utils most probably the nfs-utils package is there on your server already. ensure nfs server starts up automatically systemctl enable –now nfs-server firewall stuff firewall-cmd –add-service=nfs –add-service=rpc-bind –add-servicemountd –permanent firewall-cmd –reload add directories to share on the nfs server file […]

  • awk tricks

    some of the awk tricks listed here. might come in handy in any of my future shell scripts.

  • gpg2 – importing, exporting and revoking your keys

    lets start by listing your keys gpg2 –list-keys

  • gpg2 – using the OpenPGP encryption and signing tool to encrypt and decrypt

    most standard versions of linux distro’s come with the newer gpg2 command comes by default. the previous version of gpg is linked to the newer gpg2 packages. this means you may use the gpg and gpg2 command and it will always run the gpg2 command. an excerpt from a centos 7 below explains that

  • my .vimrc file

    everybody has their own distinct style of using the editor of their choice. when i am using vim, i prefer to have the following defined in the .vimrc file in the root directory of my user on gnu linux/mac os. use .virc to save your vi settings if you prefer using the plain old vi […]