Category Archives: Others

SSH Key Authentication with GitLab

Git, Others February 11, 2015 Leave a comment

Every time i start building a product for a new company, one of the first step is creating a repository and uploading SSH key. Instead of browsing the web looking for a reminder on how to do it, i decided i’ll post the quickest solution here.

 

1. Enter the following command in the Terminal window (Mac OS X)

ssh-keygen -t rsa

 

2. Accept default location and leave password blank (or not, up to you)

 

3. The key will get generated

Your identification has been saved in /Users/mariuszprzydatek/.ssh/id_rsa.
Your public key has been saved in /Users/mariuszprzydatek/.ssh/id_rsa.pub.
The key fingerprint is:
ce:80:76:66:5b:5d:d2:29:3d:64:66:65:e8:d3:aa:5e mariuszprzydatek@Mariuszs-MacBook-Pro.local
The key's randomart image is:
+--[ RSA 2048]----+
|                 |
|         .       |
|        E .      |
|   .   . o       |
|  o . . S .      |
| + + o . +       |
|. + o = o +      |
| o...o * o       |
|.  oo.o .        |
+-----------------+

 

4. The private key (id_rsa) is saved in the .ssh directory and used to verify the public key. The public key (id_rsa.pub) is the key you’ll be uploading to your GitLab account.

 

5. Copy your public key to the clipboard

pbcopy < ~/.ssh/id_rsa.pub

 

6. Paste the key to GitLab

 

GitLab SSH Key Authentication

 

 

Cheers!

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Git branch name in zsh terminal

Git, Others February 9, 2015 1 Comment

Ever wondered how nice it would be, to always know which git branch you’re current on, in a given directory? If so, then i encourage you to give Prezto — Instantly Awesome Zsh a try.

 

Git branch name in zsh terminal

 

You’ll find it here (as well as instruction on how to install):

https://github.com/sorin-ionescu/prezto

 

Prezto integrates nicely with (among others):

iTerm2, SSH, Ruby, Git, various editors, etc.

 

Cheers!

Amazon AWS – Installing Redis on EBS

Amazon AWS, Databases, Others, Redis August 23, 2014 Comments: 2

In this step-by-step guide i’ll show you how to install Redis on AWS (Amazon Linux AMI).

I’ll assume you’re performing steps below as a su (sudo -s).

  1. First thing you need is to have following tools installed:
    > gcc
    > gcc-c++
    > make

    yum -y install gcc gcc-c++ make

    _

  2. Download Redis: 
    cd /usr/local/src
wget http://download.redis.io/releases/redis-2.8.12.tar.gz
tar xzf redis-2.8.12.tar.gz
rm -f redis-2.8.12.tar.gz

    _

  3. Build it: 
    cd redis-2.8.12
make distclean
make

    _

  4. Create following directories and copy binaries: 
    mkdir /etc/redis /var/redis
cp src/redis-server src/redis-cli /usr/local/bin

    _

  5. Copy Redis template configuration file into /etc/redis/ (using Redis port number instance as its name (according to best practices mentioned on Redis site)): 
    cp redis.conf /etc/redis/6379.conf

    _

  6. Create directory inside /var/redis that will act as working/data directory for this Redis instance: 
    mkdir /var/redis/6379

    _

  7. Edit Redis config file to make necessary changes: 
    nano /etc/redis/6379.conf

    _

  8. Make following changes to 6379.conf
    > Set daemonize to yes (by default it is set to no).
    > Set pidfile to /var/run/redis.pid
    > Set preferred loglevel
    > Set logfile to /var/log/redis_6379.log
    > Set dir to /var/redis/6379

    _

  9. Don’t copy the standard Redis init script from utils directory into /etc/init.d (as it’s not Amazon Linux AMI/chkconfig compliant), instead download the following: 
    wget https://raw.githubusercontent.com/saxenap/install-redis-amazon-linux-centos/master/redis-server

    _

  10. Move and chmod downloaded redis init script: 
    mv redis-server /etc/init.d
chmod 755 /etc/init.d/redis-server

    _

  11. Edit redis-server init script and change redis conf file name as following:
    > REDIS_CONF_FILE=”/etc/redis/6379.conf”

    nano /etc/init.d/redis-server

    _

  12. Auto-enable Redis instance: 
    chkconfig --add redis-server
chkconfig --level 345 redis-server on

    _

  13. Start Redis: 
    service redis-server start

    _

  14. (optional) Add ‘vm.overcommit_memory = 1’ to /etc/sysctl.conf (otherwise background save may fail under low memory condition – according to info on Redis site):
    > vm.overcommit_memory = 1

    nano /etc/sysctl.conf

    _

  15. Activate the new sysctl change: 
    sysctl vm.overcommit_memory=1

    _

  16. Try pinging your instance with redis-cli: 
    /usr/local/bin/redis-cli ping

    _

  17. Do few tests with redis-cli and check that the dump file is correctly stored into /var/redis/6379/ (you should find a file called dump.rdb): 
    /usr/local/bin/redis-cli
>set testkey testval
>get testkey
>del testkey
>exit

    _

  18. Check that your Redis instance is correctly logging in the log file: 
    cat /var/log/redis_6379.log

    _

 

And that would be basically it. Cheers.