LINUX AND VMWARE STUFF

As part of system admin activities, we need to install, remove and update the system packages. Most of the Linux distros have package manager utility. Here i have listed some linux distros and its package manager. Redhat/Centos/Oracle linux - yum (Yellow-Dog Updater Modified) Fedora         - yum / DNF (Dandified YUM) opensuse         - zypper ubuntu/debian         - apt / dpkg /synaptic Arch...

Situation: Yum is  failed with Errno 256, No more mirrors to try. root@testserver# yum list available | grep erna https://rhn.test.com/pulp/repos/shared/lce-lcs_6month_rhel7/ccv-lcs_6month_rhel7/content/dist/rhel/server/7/7Server/x86_64/extras/os/repodata/repomd.         xml: [Errno 14] curl#58 - "SSL peer rejected your certificate as expired." Trying other mirror. One of the configured repositories failed (Red Hat Enterprise...

Here we are using nmcli to configure the network teaming.  nmtui : Text user Interface nmcli : Command line Interface Teaming type : loadbalance Interface         : team0, eth0, eth2 teamd package should be installed on server. We can see the previous network configuration setup by using nmcli command. root@nsk# nmcli con show NAME  UUID                       ...

If storage team extended the existing LUN instead of creating new LUN, below steps need to follow. Run multipath -ll command and search the device info which is mapped to the LUN. root@nsk# multipath -ll | grep -A 6 -i 3600a09634224747a367d4b55357c4f87 3600a09634224747a367d4b55357c4f87 dm-6 NETAPP,LUN C-Mode size=400G features='4 queue_if_no_path pg_init_retries 50 retain_attached_hw_handle' hwhandler='0' wp=rw `-+- policy='round-robin 0' prio=50 status=active  ...

Sosreport is a tool that collects configuration details, system information, diagnostic information and system logs from Linux server. Sosreport  generates  an archive report from the running system. The archive may be stored locally or centrally for recording or tracking purposes. Normally sosreport will be saved under /tmp (RHEL6) /var/tmp (RHEL7) directory on linux server. Some time we need to save the sosreport to some other temporary directory...

ausearch is a tool to search audit daemon logs based upon the events based on different search criteria.  Audit system stores log entries in the /var/log/audit/audit.log file; if log rotation is enabled, rotated audit.log files are stored in the same directory. Each event consists of three records, which share the same time stamp. Each record consists of several name=value pairs separated by a white space or a comma.  type=SYSCALL msg=audit(1510471123.129:36):...