In this example case /var/log/secure.log will be rotated daily and if the log file size exceeds 100mb rotate process will start. 1. By default system rotates all major OS logs by checking syslog file located in /etc/logrotate.d/ # cat /etc/logrotate.d/syslog /var/log/cron /var/log/maillog /var/log/messages /var/log/secure /var/log/spooler { sharedscripts postrotate /bin/kill -HUP 'cat /var/run/syslogd.pid 2> /dev/null' 2> /dev/null || true endscript } # 2. To add separate log … [Read more...] about How to Create a Custom Log File Rotation by logrotate in Linux
Linux
“docker dead but subsys locked” – error while starting docker
The Problem The docker engine package was upgraded. After that the user is not able to start the docker service, and revert back with error "docker dead but subsys locked" on verifying the status of the service. Under normal circumstances, the general solution would be to remove the lock file and the dead files of the service. This is not applicable in this condition. # rm /var/run/docker/execdriver/native/ # rm /var/lock/subsys/docker # docker info Cannot connect to the Docker daemon. Is … [Read more...] about “docker dead but subsys locked” – error while starting docker
How to Provide Credentials From a File While Mounting CIFS Share in Linux
Question: How to use a FILE instead of directly providing the username/password while mounting CIFS share. Let us assume the below, The Windows Machine IP is "10.176.x.x" Windows Folder to be mounted is called 'data' Planning to Mount the Windows share to a Linux folder called '/mnt' The credential file created on Linux machine is called '/root/cifs_creds' Below are the entry inside the file: username=geek password=xxyyzz Now run the 'mount' command on Linux box as below: # … [Read more...] about How to Provide Credentials From a File While Mounting CIFS Share in Linux
How to Change Password Of An LXC Container User Account
An LXC container has its own username and password definitions. The password for an LXC account can be changed when needed, whether or not the container is running. geeklab login: admin Password: Login incorrect Oracle Linux Server 7.1 Kernel 3.8.13-118.19.3.el6uek.x86_64 on an x86_64 Resetting forgotten LXC container user password Connect To A Running Container As The Root User If the container is running, the password can be reset without needing to stop the container. # … [Read more...] about How to Change Password Of An LXC Container User Account
Unable to start Nagios Service (CentOS/RHEL)
The Problem Unable to start Nagios Network Monitoring service after reboot. -- var/log/messages ---- May 6 09:14:28 [hostname] nagios: Checking global event handlers... May 6 09:14:28 [hostname] nagios: Checking obsessive compulsive processor commands... May 6 09:14:28 [hostname] nagios: Checking misc settings... May 6 09:14:28 [hostname] nagios: Total Warnings: 0 May 6 09:14:28 [hostname] nagios: Total Errors: 0 May 6 09:14:28 [hostname] nagios: Things look okay - No serious problems … [Read more...] about Unable to start Nagios Service (CentOS/RHEL)
The Squid Service in Failed State with Error: “Failed to make swap directory /var/spool/squid/00: (13) Permission denied”
The Problem The squid service in failed state with below error: # systemctl status squid.service ● squid.service - Squid caching proxy Loaded: loaded (/usr/lib/systemd/system/squid.service; enabled; vendor preset: disabled) Active: failed (Result: exit-code) since Wed 2019-05-01 16:34:19 GMT; 2min 50s ago Process: 2022 ExecStartPre=/usr/libexec/squid/cache_swap.sh (code=exited, status=1/FAILURE) May 01 16:34:19 [hostname] systemd[1]: Starting Squid caching proxy... May 01 … [Read more...] about The Squid Service in Failed State with Error: “Failed to make swap directory /var/spool/squid/00: (13) Permission denied”
“Failed to start test.mount: Unit is not loaded properly: Invalid argument.” – While mounting a fileystem using systemd
The Problem Under /etc/systemd/system the mount unit file was created with name "test.mount". The mount point directory created is /home/test. Under the mount unit file options in the "Where=" the mount point configured is /home/test. The device where the filesystem will be mounted is /dev/xvdb1 and it was defined under "What=" option. When configuring mount unit file to mount a filesystem, it fails with the following error: # systemctl start test.mount Failed to start test.mount: Unit is not … [Read more...] about “Failed to start test.mount: Unit is not loaded properly: Invalid argument.” – While mounting a fileystem using systemd
How to Completely Disable the ‘lvm2-lvmetad.socket/service’ on CentOS/RHEL 7
Disabling lvm2-lvmetad.socket/service on CentOS/RHEL 7 system works while the system is running, but after a reboot, it comes up again. This post will show you how to prevent this from happening. 1. Modify the /etc/lvm/lvm.conf file with your favorite file editor, like vi or nano, and switch the value of "use_lvmetad = " from 1 to 0. # vi /etc/lvm/lvm.conf use_lvmetad = 0 2. Stop, Disable, and Mask the lvm2-lvmetad service/socket. # systemctl stop lvm2-lvmetad.service … [Read more...] about How to Completely Disable the ‘lvm2-lvmetad.socket/service’ on CentOS/RHEL 7
How to install/remove/query/update RPM packages in Linux (Cheat Sheet)
Maintaining Software Using RPM (Red Hat Package Manager) RPM is a powerful software manager which can be used to build, install, query, verify, update, and uninstall individual software packages. An RPM package consists of an archive of files, and package information such as name, version, a description and information about dependencies on other RPM packages. RPM is more than a Red Hat specific tool. Many other modern distributions, such as Ubuntu and SuSE, use RPM too. Benefits of using … [Read more...] about How to install/remove/query/update RPM packages in Linux (Cheat Sheet)
Extend the size of /boot partition on virtualized environment (CentOS/RHEL 6)
The scope of this post is to explain the steps involved in increasing the /boot filesystem, when no sufficient space available to install new kernel package. Though we have standard methods to reduce the size of /boot i.e. removing unused kernel and image files from boot, as an alternate approach, this post illustrate the steps to expand size of boot partition. The following should be the scenario were this can be applied, OVM/Vmware guest machine. Guest Backup should be taken from … [Read more...] about Extend the size of /boot partition on virtualized environment (CentOS/RHEL 6)