Category Archives: Ubuntu

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17
01
15
 2 Comments

Installing Git on Ubuntu 12.04 and enabling HTTP access with Nginx

Posted by | Nginx, Ubuntu | Tagged |

Git is a good alternative for developers who need a version control supported on both Windows and Linux platforms. Below I provided basic steps for installing Git on Ubuntu 12.04 and enabling HTTP access to the repositories with Nginx web server.

Installing required packages

First, we need to install Nginx and Git packages:

apt-get install nginx git

by default Nginx processes will run as www-data, (check “user” keyword in /etc/nginx/nginx.conf configuration file). Git installation has not created any user yet.

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03
01
15
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Installing Jabber Messaging Service on Ubuntu 12.04

Posted by | Ubuntu |

Ejabberd (Jabber daemon written in Erlang programming language) can be easily installed on Ubuntu 12.04 Server (Precise Pangolin) with the following command:

apt-get install ejabberd

The only steps needed to make Ejabberd work after the installation are to specify admin user and hostname in /etc/ejabberd/ejabberd.cfg file:

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Options which are set by Debconf and managed by ucf

%% Admin user
{acl, admin, {user, "admin", "developernote.com"}}.

%% Hostname
{hosts, ["developernote.com"]}.

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

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11
09
14
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Nginx 502 Bad Gateway error after updating Ubuntu 12.04

Posted by | Nginx, Ubuntu |

Today I updated my Ubuntu Server to 12.04.5 LTS (release 12.04, codename: precise), and got “502 Bad Gateway” on all my websites.

I checked Nginx log files and found that Nginx cannot open the socket created by PHP-FPM:

2014/09/11 19:01:03 [crit] 2741#0: *107 connect() to unix:/var/run/www-devnote.sock failed (13: Permission denied) while connecting to upstream, client: XXX.XX.X.XX, server: ~^(www\.)?(?<domain>.+)$, request: “GET /2014/04/using-a-wpf-control-in-a-mfc-application/ HTTP/1.1”, upstream: “fastcgi://unix:/var/run/www-devnote.sock:”, host: “developernote.com”

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02
09
13
 3 Comments

How to encrypt MySQL database in Ubuntu 12.04 LTS

Posted by | MySQL, Ubuntu |

encrypt MySQL databaseProbably, the easiest way to encrypt MySQL database in Ubuntu is by using ecryptfs-utils. Install ecryptfs-utils:

apt-get install ecryptfs-utils

Mount /usr/local/encrypted directory and create mdf directory for MySQL data files (you will be prompted for passphrase and other options):

mkdir /usr/local/encrypted
mount -t ecryptfs /usr/local/encrypted /usr/local/encrypted
cd /usr/local/encrypted
mkdir mdf
chug.sh mysql mdf
chmod og-rwx mdf

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30
08
13
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Ubuntu VPS Performance Monitoring

Posted by | Ubuntu | Tagged |

I run several PHP websites in Jooma and WordPress on Ubuntu VPS using Nginx as the web server with PHP-FPM for processing PHP. In most cases all the sites work fast enough, but sometimes (probably once a couple days) I got a message from Yandex (Russian search engine like Google) telling that one of my websites did not respond within 5 seconds. I set up Nginx slowlog and detected that sometimes HTTP requests are processed for more than 5 seconds:

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29
08
13
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Monitoring CPU Steal Time with command line in Ubuntu

Posted by | Ubuntu | Tagged |

Bash command that writes CPU Steal Time along with other CPU usage statistics from top command header once in a second to MySQL database:

top -b -d 1 | ts ‘%Y-%m-%d %H:%M:%S’ | sed -rn “s/(.{19} )Cpu\(s\):\s+([0-9]+\.[0-9]+)%us,\s+([0-9]+\.[0-9]+)%sy,\s+([0-9]+\.[0-9]+)%ni,\s+([0-9]+\.[0-9]+)%id,\s+([0-9]+\.[0-9]+)%wa,\s+([0-9]+\.[0-9]+)%hi,\s+([0-9]+\.[0-9]+)%si,\s+([0-9]+\.[0-9]+)%st(.*)/INSERT INTO m_perf_stat (CDate, cpu_us,  cpu_sy,  cpu_ni, cpu_id,  cpu_wa,  cpu_hi,  cpu_si,  cpu_st) VALUES (‘\1′, \2, \3, \4, \5, \6, \7, \8, \9);/p” | mysql -u <username> -p<password> <database>

that’s the longest bash command I ever written in my life Улыбка

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15
08
13
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Configuring Firewall to enable FTP, SSH and HTTP on Ubuntu

Posted by | Ubuntu |

FirewallCheck your currently implemented firewall rules with the following command:

iptables -L

Examine the output. On a clean Ubuntu installation you will see an empty ruleset:

Chain INPUT (policy ACCEPT)
target     prot opt source               destination

Chain FORWARD (policy ACCEPT)
target     prot opt source               destination

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination

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21
07
13
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How to encrypt swap on Ubuntu 12.04

Posted by | Ubuntu |

Without going into particulars, it suffices to say that Ubuntu 12.04 has the following script that sets up encrypted swap:

ecryptfs-setup-swap

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28
05
13
 1 Comment

How to start Apache OFBiz demo under Ubuntu Server 12.04

Posted by | Ubuntu |

Install JDK 6 with the following command:

apt-get install default-jdk

Download the latest OFBiz version, extract it in your home directory and do the following steps described in the README file.

Having apache-ofbiz-XX.XX.XX as the current directory execute the following command:

./ant load-demo

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18
05
13
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How to install Apache Tomcat 7 on Ubuntu Server 12.4 LTS

Posted by | Ubuntu |

Today I successfully installed Tomcat 7 on Ubuntu Server 12.4 LTS with the following commands (executed as root):

apt-get install default-jdk
apt-get install tomcat7
apt-get install tomcat7-admin
apt-get install tomcat7-examples

(more…)

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