Install FTP server vsftpd on CentOS 7.1

1. yum install vsftpd ftp -y
2. vi /etc/vsftpd/vsftpd.conf with following changes:
## Set to "NO" ##
anonymous_enable=NO

## Uncomment ##
ascii_upload_enable=YES
ascii_download_enable=YES

## Uncomment - Enter your Welcome message - This is optional ##
ftpd_banner=Welcome to UNIXMEN FTP service.

## Add at the end of this  file ##
use_localtime=YES

3. systemctl restart vsftpd
4. systemctl enable vsftpd

Install LAMP on Centos 7.1

Install Apache

• yum install httpd 
• systemctl start httpd.service 
• systemctl enable httpd.service 

Install MySQL

• yum install mariadb-server mariadb
• systemctl start mariadb
• mysql_secure_installation 
• systemctl enable mariadb.service 

Install PHP

• yum install php php-mysql 
• systemctl restart httpd.service 

Install PHPmyadmin

• yum install epel-release 
• yum install phpmyadmin
• systemctl restart httpd.service 

Grant Sudo Privileges To a User on Centos 7

From the command line:
gpasswd -a webapp wheel

Install Elasticsearch on Centos 7.1

1. Download Current Java Runtime Environment from: http://www.oracle.com/technetwork/java/javase/downloads/jre8-downloads-2133155.html
2. sudo rpm -Uvh jre-8u45-linux-x64.rpm
3. java -version
4. sudo rpm -Uvh https://download.elastic.co/elasticsearch/elasticsearch/elasticsearch-1.6.0.noarch.rpm
5. Define network.host: localhost in /etc/elasticsearch/elasticsearch.yml
6. sudo systemctl daemon-reload
7. sudo systemctl enable elasticsearch.service
8. sudo systemctl start elasticsearch.service
9. Execute curl -XGET 'http://localhost:9200/_cluster/health?pretty=true' to make sure the server is up and running

Logrotate uses 100% CPU issue on CentOS

A typical /var/lib/logrotate.status looks like:

logrotate state -- version 2
"/var/log/daemon.log" 2015-5-9
"/var/log/portage/elog/summary.log" 2015-5-9
"/var/log/mysql/mysql.err" 2015-5-9
"/var/log/mysql/mysql.log" 2015-5-9
"/var/log/mysql/mysqld.err" 2015-5-9
"/var/log/atop/dummy_before" 2015-5-25
"/var/log/atop/dummy_after" 2015-5-25
"/var/log/net-snmpd.log" 2015-5-9
"/var/log/xinetd.log" 2015-5-23
"/var/log/wtmp" 2015-5-9

It is a small file say hundred bytes, but the size may reaches megabytes if there are some config errors.

Following command can be used to check the configuration of logrotate without change anything:

sudo /usr/sbin/logrotate -d /etc/logrotate.conf

reading config file /etc/logrotate.conf

including /etc/logrotate.d

reading config file daemon

reading config info for /var/log/daemon.log

reading config file elog-save-summary

reading config info for /var/log/portage/elog/summary.log

reading config file mysql

...

It may indicate a bad logrotate.status file if the command hangs with a huge logrotate status file,  

To fix the problem, simply delete the logrotate.status. The logrotate will re-create a new one for you.

SVN client side problems

If there is a performance or strange issue on a specific tree try the following:

1. In Windows, delete the roaming profile folder %AppData%\Subversion. 
2. Rename your current tree then chekout a fresh copy to work with. Then copy any uncommitted files from the old (renamed) tree to the new tree.  

Setup Color Scheme Distinguished For Vim

Run mkdir -p ~/.vim/colors

Download distinguished.vim and move to the directory.

Add following to ~/.vimrc
syntax on
colorscheme distinguished

Append following to ~/.bashrc
        export TERM=xterm-256color

Run . ~/.bashrc to bring up the term setting.

For more schemes examples see http://www.vimninjas.com/2012/08/26/10-vim-color-schemes-you-need-to-own