The creation of awx users is handled by the rpm. When the setup script for the package "automation-controller-server-4.x.x-x.el8ap.x86 64" is run, the awx user is created. The user creation operation is handled by the package script. Commands can be used to verify that: # rpm -q --scripts automation-controller-server-4.x.x-x.el8ap.x86_64 The awx user task present in the …
Category: Linux
TFTP “Transfer timed out” with firewalld in CentOS 7 and 8
You are facing an issue while accessing TFTP server, getting 'Transfer timed out' error while put and get. But it works after disabling the firewall. Follow the following steps to resolve this error. Remove the not working TFTP client service. firewall-cmd --remove-service tftp-client Two possible solutions can be applied based on your CentOS version. CentOS …
How to calculate memory assigned for nodes in a cluster
Run the following command to calculate the currently used memory (megabytes) in openshift container platform 4.x. oc adm top node | awk '{ sum+=$4} END {print sum}' Run the following command to calculate the used memory (megabytes) for worker nodes in the cluster. oc adm top node --selector='node-role.kubernetes.io/worker=' | awk '{ sum+=$4} END {print sum}' …
Why repquota output different size as compared to du?
In CentOS 5, 6, and 7, repquota shows different sizes compared to du output as shown below. [root@server]# repquota /xyz | awk 'NR == 3 || NR == 4|| /username/' Block limits File limits User used soft hard grace used soft hard grace username -- 100663296 152043520 157286400 2584811 0 0 [root@server]# du -sch /xyz …
How do change the location of /var/log/squid/squid.out file?
To change the location of squid.out file, copy /usr/libexec/squid/cache_swap.sh to a new location. # cp /usr/libexec/squid/cache_swap.sh /usr/libexec/squid/cust_cache_swap.sh Open with vi and edit the following section in the new file cust_cache_swap.sh. squid -N -z -F -f $SQUID_CONF >> /new/path/to/squid.out 2>&1 Copy the unit file of squid.service as follows. # cp /usr/lib/systemd/system/squid.service /etc/systemd/system/ Edit /etc/systemd/system/squid.service. (before) ExecStartPre=/usr/libexec/squid/cache_swap.sh …
Why packets drops against ‘rx_fifo_errors’ parameter in the output of ‘ethtool -S ‘ ?
The output of ethtool -S <interface> reveals receive fifo errors. Additionally, rx_queue_<n>_drops, the total of which equals the value of rx_fifo_errors, are reported. # ethtool -S eth0 | egrep 'rx_fifo|drops' rx_fifo_errors: 120674 rx_queue_0_drops: 4032 rx_queue_1_drops: 3036 rx_queue_2_drops: 5904 rx_queue_3_drops: 0 rx_queue_4_drops: 228 rx_queue_5_drops: 65656 rx_queue_6_drops: 19267 rx_queue_7_drops: 22551 # ethtool -S eth0 | egrep drops …
lsof does not list as many files with -p as when used with grep and awk
Only files opened by the specified PID are listed using the lsof command with the -p option.The -p option entirely ignores files generated by a thread with a TID. When we grep for a specific PID, it lists all the lines where the PID is located while considering the files opened by a thread. The …
How to hide processes from other users in ps and top in CentOS Server?
The hidepid option in RHEL has the value 0 by default. This implies that all data is visible to every user. The directory entries in /proc will remain visible but inaccessible when set to 1.To keep the data hidden from /proc, set the value to 2. Run the following command to instantly apply the changes. …
How to upgrade or update Ansible without upgrading Ansible Tower?
Users can upgrade the Ansible version without also upgrading Ansible Tower. Ansible should function well with Tower after being updated to the desired version using package manager (not pip), yum, or apt. When executed from the source, the most recent stable Ansible version is the only version Ansible Tower supports. Ansible cannot be installed using …
How to deactivate Ansible Tower/Automation Platform license/subscription?
You can initiate DELETE /api/v2/config/ API to deactivate Ansible tower or automation platform subscription. The command to deactivate is given below. $ curl -X DELETE https://<MY_ANSIBLE_TOWER_URL>/api/v2/config/ -u admin -kEnter host password for user 'admin': <password for admin user>
Failed to create notification semaphore: Invalid argument – LVM error
lvcreate gives the following error about semaphore. lvcreate -n test_lv10 -L 1G test_vg_3 Found duplicate PV XfbmuZ2c2MPAb8r0TDIBNrcyUx0yMZpu: using /dev/emcpowerh not /dev/sdb Failed to create notification semaphore: Invalid argument Unable to resume test_vg_3-test_lv10 (253:3) Failed to activate new LV. Failed to create notification semaphore: Invalid argument Unable to deactivate test_vg_3-test_lv10 (253:3) Unable to deactivate failed new …
How to create LVM snapshot for system maintenance?
This article shows step-by-step instructions for getting a CentOS system ready and making LVM snapshots for system maintenance or software upgrades. LVM snapshots are meant to be used as a restoration point if anything goes wrong during the upgrade process. The suggestion is to run this procedure in a test environment first. Also, one of …
How to shrink an LVM Logical Volume
Since shrinking is not supported on these file systems, you cannot reduce the size of a logical volume that houses a GFS2 or XFS file system. The lvreduce command typically warns about potential data loss and requests confirmation. In some circumstances, such as when the logical volume is inactive, or the —resizefs option is not …
How to convert a standard partitioned system to LVM?
When you add a new device to the server, you need to partition it up. You only need two of them. This will make a 1GB device for /boot and use the rest for LVM. # fdisk /dev/<new_dev> Command: n Primary?: p Number: 1 Start: <enter> End: 1G Command: n Primary?: p Number: 2 Start: …
How to delete a non-root LVM volume?
If the non-root LVM volume, Volume Group, and Physical Volume used for the LV is no longer needed on the system, they can be deleted using the steps below. If the LVM volume has any critical data, make sure to make a copy of that data before moving on to the following steps. Replace /dev/sdc1 …
