xsos – a tool for sysadmins and support

2016-08-24 1 min read Fedora Learning Linux

Here is a very nice article that you may find useful

https://access.redhat.com/discussions/469323

change the output format for time command

2016-08-16 1 min read Bash

If you are doing some scripting and using ‘time’ command, then you know sometimes it becomes difficult to capture the output as the output would be something like this:

: amit ; time ls

real    0m0.002s
user    0m0.000s
sys 0m0.001s

So, it is better to change that format. Here is simple example:

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TIMEFORMAT=’real %3R user %3U sys %3S pcpu %P’ time ls: amit ; TIMEFORMAT=’real %3R user %3U sys %3S pcpu %P’ time ls
0.00user 0.00system 0:00.00elapsed 0%CPU (0text+0data 2432max)
0inputs+0outputs (0major+109minor)pagefaults 0swaps: amit ; TIMEFORMAT=’real %3R user %3U sys %3S’; amit ; time ls
real 0.001 user 0.001 sys 0.000; amit ;; amit ; TIMEFORMAT=’TIMEOUTPUT = real %3R user %3U sys %3S’; amit ; time ls
TIMEOUTPUT = real 0.001 user 0.001 sys 0.000; amit ;

Generate random string for various use case

2016-08-08 1 min read Bash

Some times I need random string, for example to use as email seperator or to use in some API. One way is to use tools like /dev/[u]random or od and other such. But they seem cubersome after I figured this out.

openssl rand <length>
openssl rand 10

This alone without some parameters is not interesting thoug. You can use ‘-base64’ or ‘-hex’ to select the encoding.

So if you execute the above you will get something like this

supernova – manage multiple openstack environment

2016-08-01 1 min read Vurtualization

supernova is an easy to use tool that helps manage multiple openstack environments.

Details –

Name        : supernova

Arch        : noarch

Epoch       : 0

Version     : 2.2.0

Release     : 2.fc24

Size        : 62 k

Repo        : @System

From repo   : fedora

Summary     : Use novaclient with multiple OpenStack nova environments the easy way

URL         : https://github.com/major/supernova

License     : ASL 2.0

Description : supernova manages multiple nova environments without sourcing

novarc files or mucking with environment variables.

To get started, start with installing supernova with

Install virtual machines in one line

2016-07-25 1 min read Vurtualization

To install a VM from command line, you can use the following command. Change the required parameters as need but you need to change at-least CDROM iso image and disk-path.

virt-install \
    -n myVM \
    --description "Test VM" \
    --os-type=Linux \
        --os-variant=centos7 \
        --ram=2048 \
        --vcpus=2 \
        --disk path=./myVM.img,bus=virtio,size=10 \
        --graphics none \
        --cdrom  <Image installtion CDROM>.iso \
        --net user

sysreporter on Fedora – basic system report in email

2016-07-18 1 min read Fedora

From the packages github page:

{#user-content-sysreporter.anchor}SysReporter

SysReporter (System Reporter) is a bash script that runs and aggregates a set of reports about its host system. The report can then be emailed to the system administrator on a daily, hourly, minutely basis.

and from dnf info

Name        : sysreporter
Arch        : noarch
Epoch       : 0
Version     : 3.0.4
Release     : 1.fc24
Size        : 17 k
Repo        : @System
From repo   : updates
Summary     : Basic system reporter with emailing
URL         : https://github.com/onesimus-systems/sysreporter
License     : MIT
Description : Basic system reporter with emailing
Continue reading

Get your local IP address like pro

2016-07-10 1 min read Bash

In shell scripts if you need to get you local IP address corresponding to your hostname then you can use this command

hostname -i

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{#user-content-sysreporter.anchor}SysReporter

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