firewalld – enable logging

2016-05-16 1 min read Fedora
firewalld by default does not allow packets that are dropped. In some cases, you need to find out if some packet is being dropped or not. For doing so you may want to enable logging of dropped packets with the following command: sudo firewall-cmd --set-log-denied=all This will enable logging all the packets and help you figure out if firewalld is dropping the packet.

speed up journalctl

2016-04-25 1 min read Fedora
Sometime back I noticed that whenever I run my favourite command, viz. journalctl -xn -f -l it was taking more time than usual. So, I thought to dig more into it and finally found that the following command: sudo journalctl --disk-usage showed that journalctl was using some huge space in tune of about 4GB. So, the solution was simple, vaccum the journal entries and the command to do so is : Continue reading

virsh – show ip address of all running VMs

2016-02-01 1 min read Fedora Learning Vurtualization
If you are using the libvirt and associated tools, then you must be aware about virt-manager. However this being a GUI tools, it is not possible to always use this. “virsh” is a good option for this. To start with, if you need to know all the VMs all the running VMs, then you can use (to only view the names): virsh list --name Extending this to make it more useful is the case if you need to know the IP address for the running VMs. Continue reading

Disk usage by file type

2015-11-30 1 min read Fedora Learning
Trying to find the total usage for each of the file types by extension, then here is a quick bash function for you : disk_usage_type () { find . -name '*'$1 -ls | awk ' BEGIN{ a[0]="Bytes"; a[1]="KB"; a[2]="MB"; a[3]="GB"; } {sum+=$7; files++;} END{ print "Total sum is ::\t" sum; print "Total files ::\t" files; while (sum > 1024) { sum=sum/1024; count++; }; print sum" "a[count]; }' } Just define the function in one of your bash startup files. Continue reading

Text file based presentation tool – pinpoint

2015-10-05 1 min read Fedora
Pinpoint description: Name : pinpoint Summary : A tool for making hackers do excellent presentations URL : https://live.gnome.org/Pinpoint License : LGPLv2+ Description : Pinpoint a simple presentation tool that hopes to avoid audience death by bullet point and instead encourage presentations containing beautiful images and small amounts of concise text in slides. Pinpoint is a presentation tool. The source file for the presentation is text file and thus very easy to manage. Continue reading

Executing commands on multiple hosts

2015-09-21 1 min read Fedora Learning Linux
If you have to execute the same command in multiple hosts, then you can use mussh: Description : Mussh is a shell script that allows you to execute a command or script over ssh on multiple hosts with one command. When possible mussh will use ssh-agent and RSA/DSA keys to minimize the need to enter your password more than once. First install mussh with the following command dnf install mussh Now to run this for multiple hosts, you can run like this Continue reading
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