power saving on laptop

One of the easiest way to make sure that you can have a decent battery life is

sudo yum install tlp smartmontools
sudo systemctl enable tlp
sudo systemctl start tlp

And after this you can check the status like this:

sudo tlp stat
— TLP 0.9 ——————————————–

+++ Configured Settings: /etc/default/tlp
TLP_ENABLE=1
TLP_DEFAULT_MODE=AC
DISK_IDLE_SECS_ON_AC=0
DISK_IDLE_SECS_ON_BAT=2
MAX_LOST_WORK_SECS_ON_AC=15
MAX_LOST_WORK_SECS_ON_BAT=60
SCHED_POWERSAVE_ON_AC=0
SCHED_POWERSAVE_ON_BAT=1
NMI_WATCHDOG=0
ENERGY_PERF_POLICY_ON_AC=performance
ENERGY_PERF_POLICY_ON_BAT=powersave
DISK_DEVICES=”sda sdb”
DISK_APM_LEVEL_ON_AC=”254 254″
DISK_APM_LEVEL_ON_BAT=”128 128″
SATA_LINKPWR_ON_AC=max_performance
SATA_LINKPWR_ON_BAT=min_power
AHCI_RUNTIME_PM_TIMEOUT=15
PCIE_ASPM_ON_AC=performance
PCIE_ASPM_ON_BAT=powersave
RADEON_POWER_PROFILE_ON_AC=high
RADEON_POWER_PROFILE_ON_BAT=low
RADEON_DPM_STATE_ON_AC=performance
RADEON_DPM_STATE_ON_BAT=battery
RADEON_DPM_PERF_LEVEL_ON_AC=auto
RADEON_DPM_PERF_LEVEL_ON_BAT=auto
WIFI_PWR_ON_AC=off
WIFI_PWR_ON_BAT=on
WOL_DISABLE=Y
SOUND_POWER_SAVE_ON_AC=0
SOUND_POWER_SAVE_ON_BAT=1
SOUND_POWER_SAVE_CONTROLLER=Y
BAY_POWEROFF_ON_BAT=0
BAY_DEVICE=”sr0″
RUNTIME_PM_ON_AC=on
RUNTIME_PM_ON_BAT=auto
RUNTIME_PM_ALL=1
RUNTIME_PM_DRIVER_BLACKLIST=”radeon nouveau”
USB_AUTOSUSPEND=1
USB_BLACKLIST_WWAN=1
RESTORE_DEVICE_STATE_ON_STARTUP=0

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enki editor – amazing for md and rst files

First, you need to install enki. YOu can do so with

sudo yum install enki

And then you can use the editor as usual. The first thing that you will notice is the navigator window. And here is screenshot for you.

As you can see if you make a typo or mistake then you will immediately be warned with RED color.

xsos – a tool for sysadmins and support

Here is a very nice article that you may find useful

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

change the output format for time command

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:

  <td>
    <div class="text codecolorer">
      &nbsp;
    </div>
  </td>
</tr>

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

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

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

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