RHEL 7 Minimal Installation

Using "weechat" config Gtalk.

Installation weechat on Fedora 20

yum -y install weechat libnotify notify-python wget python-xmpp

Configuration

$weechat-curses

Setup scripts

$ cd ~/.weechat/python/autoload
$ wget http://weechat.org/files/scripts/weeget.py  

/python load weeget
/weeget
/weechat install buffers
/set weechat.bar.buffers.position top
/weechat install jabber

/jabber add gtalk rajatjpatel@gmail.com yousetthatpasswdisworkingnow talk.google.com:5223
/jabber connect gtalk

To install Docker on Fedora

Docker-based container sandbox provides a number of advantages for application deployment environment, such as lightweight isolation, deployment portability, ease of maintenance, etc.

Why docker?
• Smaller than VMs • Improved performance • Secure • Flexible

Not only for the cloud environment, Docker can also be quite useful for end users, especially when you want to test out particular software under a specific Linux environment. You can easily spin up a Docker container for the target environment, install and test the software in it, and then throw away the container once you are done. The whole process from beginning to end is quite efficient, and you can avoid messing up your end system all along.

In this post, I am going to describe how to create and manage Docker containers on Fedora.

To install Docker on Fedora, use the following commands:

# yum install docker-io
# systemctl start docker.service
# systemctl enable docker.service

Basic Usage of Docker
To start a new Docker container, you need to decide which Docker image to use for the container. You can search the official Docker image index which lists publicly available Docker images. The Docker index includes Linux base images managed by Docker team (e.g., Ubuntu, Debian, Fedora, CentOS), as well as user-contributed custom images (e.g., MySQL, Redis, WordPress).

For example, to start a Fedora/Ubuntu container in the interactive mode, run the following command. The last argument '/bin/bash' is to be executed inside a container upon its launch.

docker run -i -t ubuntu /bin/bash or docker pull ubuntu /docker pull fedora

The first time you run the above command, it will download available Ubuntu docker image(s) over networks, and then boot up a Docker container using the image. A Ubuntu container will boot up instantly, and you will see a console prompt inside the container. You can access a full-fledged Ubuntu operating system inside the container sandbox.

list of all containers

docker ps -a

Start container of your choice

docker start [container-id]

Remove container from you local repo

docker rm [container-id]

Running container in order to view or interact with the container

docker attach [container-id]

To remove a container image from the local repository:

docker rmi [image-id]

To search a container image from repositry

docker search fedora or docker search centos

Linux Performance Analysis and Tuning

What is “tuned” ?

Tuning profile delivery mechanism

Red Hat ships tuned profiles that improve performance for many workloads...hopefully yours!

To install tuned:

# yum install tuned -y

Now start the services provided by tuned:

# service tuned start

# chkconfig tuned on

# service ktune start

# chkconfig ktune on

To find the current active profile and state of service:

# tuned-adm active
Current active profile: default
Service tuned: enabled, running
Service ktune: enabled, running

To list all the available profiles:

# tuned-adm list
Available profiles:
- default
- throughput-performance
- laptop-ac-powersave
- spindown-disk
- desktop-powersave
- laptop-battery-powersave
- latency-performance
- server-powersave
- enterprise-storage
Current active profile: default

To switch to a different profile:
# tuned-adm profile spindown-disk
NOTE: spindown-disk is one of the profiles

Each profile has 4 configuration file under /etc/tune-profiles/<profile-name>. If you want to create a profile of your own, simply copy one of the profile directory with a different name, change the config files inside it according to your own requirement and activate it.
# cd /etc/tune-profiles/
# cp -a default myprofile
# cd myprofile
# ls
ktune.sh  ktune.sysconfig  sysctl.ktune  tuned.conf

# tuned-adm list
Available profiles:
- balanced
- desktop
- latency-performance
- powersave
- sap
- throughput-performance
- virtual-guest
- virtual-host
Current active profile: balanced

# tuned-adm profile myprofile

In case if you want to disable all tuning, then run:
# tuned-adm off or #server tuned stop

# tuned-adm profile throughput-performance
# tuned-adm active
Current active profile: throughput-performance
# time taskset -c 0 seq 1 60000000 > /dev/null

real 0m0.689s <--
user 0m0.676s
sys 0m0.012s
# service tuned stop
Redirecting to /bin/systemctl stop  tuned.service
# time taskset -c 0 seq 1 60000000 > /dev/null

real 0m0.698s <--
user 0m0.686s
sys 0m0.012s

Above sample from laptop.

# uname -a

Linux rajat.patel.fc20 3.14.2-200.fc20.x86_64 #1 SMP Mon Apr 28 14:40:57 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux