amit - Amit's Blog (Page 4)

Extending an LVM With FreeSpace

There can be a number of scenarios you want to extend an LVM. a. New Hard Drive b. Free Space c. Extended disk in a VM If you just extended space, you have that as raw filesystem. So just open fdisk and create new partition and start working on the

Linux

Installing Mono Tools in Centos

Mono tools are the collection of libraries and framework , that make the possibility of using .net based applications and gui in linux. They are not available in the standard repositories, so we have to create a repo : vi /etc/yum.repos.d/mono.repo [mono] name = novell-mono baseurl=http://ftp.

mysql

Mysqldump Tips and Tricks

MySQL Database Backup Ignore one or more tables while doing mysqldump : mysqldump -u username -p database --ignore-table=db.table1 --ignore-table=db.table2 > mysqldump.sql``` ****Compress the output of mysqldump :**** mysqldump -u username -p database | /bin/gzip -9 > filename.

vmware

Starting and stopping vmware from linux shell

View The list of Virtual Machines: vmrun -T server -h https://localhost:8333/sdk -u root -p list Stopping a Virtual Machine: vmrun -T server -h https://localhost:8333/sdk -u root -p stop "[standard] /host.vmx" Starting A Virtual Machine: vmrun -T server -h https://localhost:8333/

Generate Certificate signing request (CSR) with openssl

openssl req -nodes -newkey rsa:2048 -keyout server_name.key -out server_name.csr

Permission denied: proxy: HTTP

Permission denied:proxy: HTTP :: This error is caused when you try to use proxy balancer when seLinux is enabled. The value for httpd_can_network_connect is turned off by default. You can work around this problem as explained below. See the selinux status by issusing the command below : sestatus

mysql master master replication with ssl encryption

Lets assume the two servers to be serverA and serverB **Create the certificates to use with mysql replication:**openssl genrsa 2048 > ca-key.pem openssl req -new -x509 -nodes -days 1000 -key ca-key.pem > ca-cert.pem Note: The common name must be different for two certificates, or it will

Changing ethernet name in Vmware

Edit the file below : /etc/udev/rules.d/something-persistent-net-rules Do not forget to restart the server.

Install OSsec on Centos

1. Download Ossec : wget <a href="http://www.ossec.net/files/ossec-hids-2.7.tar.gz" title="http://www.ossec.net/files/ossec-hids-2.7.tar.gz">http://www.ossec.net/files/ossec-hids-2.7.tar.gz</a> tar -zxvf ossec-hids-2.7.tar.gz cd

pcre

Spam Filtering with postifx and pcre

1. Check if postfix has pcre support : postconf -m 2. Add the below lines to main.cf vi /etc/postfix/main.cf body_checks = pcre:/etc/postfix/body_checks.pcre header_checks = pcre:/etc/postfix/header_checks.pcre``` 3. Put the keywords and details

install rar unrar in centos

Download the package : wget http://dag.wieers.com/packages/unrar/unrar-3.6.2-1.el4.rf.i386.rpm Install `#rpm -Uvh unrar-``` #unrar e -kb filename.rar

Adding default gateway outside subnet

route add -host x.x.x.x dev eth0 route add default dev eth0 gw x.x.x.x```

Shell script to ssh to a remote host without specifying the port

#!/bin/bash PORT="non standard port number" if [ -z "$1" ]; then echo "Usage: $0 hostname" else <

Apache rewrite sample rules

Example Rules domain.com permanently moved to domain2.com RewriteCond %{HTTP_HOST} ^www.domain.com$ [NC] RewriteRule ^(.*)$ http://www.domain2.com/$1 [R=301,L] domain.com/page.html moved to domain.com/new_page.html temporarily RewriteRule ^page.html$ new_page.html [R,NC,L] **Nice looking URLs (no

Debug apache rewrite

Add these two line to your httpd.conf immediately after RewriteEngine On. `RewriteLog “/var/log/httpd/rewrite_log”``` RewriteLogLevel 9

Bash one liners

Rename multiple files: for i in *.dns; do mv "$i" "basename $i .dns.zone"; done or for i in *.JPG; do mv "$i" "${i/.JPG}".jpg; done

Samba Tutorial

Adding a machine to samba : useradd -s /bin/false -d /dev/null machine_name$

Archiving and compressing tuotorials tar and gzip

Creating a Tarball with compression: tar -czvf tarball.tar.gz folder/ Extracting a Tarball: tar -zxvf tarball.tar.gz Viewing the contents of a tarball tar -tvf tarball.tar.gz Extracting a single file from tarball tar -zxvf tarball.tar.gz folder/filename or tar --extract --file=tarball.tar.gz

Shell Script to Backup all tables separately

#!/bin/bash SKIPDB="mysql test" BACKUP_DIR="/backup/dir" DBS="$(mysql -Bse 'show databases')" for db in $DBS;

Postfix

Postfix Tips and Tricks

Postfix mail for domain.com loops back to myself Update mydestination using postconf or by editing main.cf file: mydestination = localhost.$mydomain, localhost, mail.example.com Once done reload postfix: service postfix reload Sender address rejected not owned by user Remove ‘reject_sender_login_mismatch’ in postfix /etc/postfix/main.

Apache Rewrite Cheat Sheet

Regular Expression Syntax ^ Start of string $ End of string . Any single character (a|b) a or b (…) Group section [abc] Item in range (a or b or c) [^abc] Not in range (not a or b or c) a? Zero or one of a a* Zero or more of a

Apache rewrite tutorials

Apache Rewrites can be handy in various scenarios. In order to use apache rewrite you have to have the mod_rewrite enabled. Syntax: RewriteRule [Optional Flags] <Directory /var/www/html/sample/> RewriteEngine On RewriteRule ^(test)/([0-9A-Za-z-]+)$ test.php?id=$2 [L] This will redirect url/test/53xml to

Install Redmine with ruby and thin on Centos

Get the Latest Source from svn: Download Ruby Version 1.8.7 RubyForge [http://ftp.ruby-lang.org/pub/ruby/ruby-1.8.7-p352.tar.gz] wget http://ftp.ruby-lang.org/pub/ruby/ruby-1.8.7-p357.tar.gz Checkout Redmine from svn svn co http://redmine.

bash script to cd to a path

If you need to login to a server and frequently switch to a path, you might want to create a shell script to switch . eg. #!/bin/bash cd /path/to/where/you/want/to/go``` Now the trick is you need to run the

Javascript hide element on click