How to Add swap file in LInux

In my exapmle i increase 512mb RAM and create 1 gb swap space for it. Not use another hdd. But i strongly recommend alwayz use HDD.

create swap file use this cmd.
#dd if=/dev/zero of=/swapfile bs=1024 count=1022976 (*999mb)
#mkswap /swapfile
enable swap file immeditae
#swapon /swapfile

For parament save entry in /etc/fstab file. like this
/swapfile swap swap defaults 0 0

This work for you.

P.S :- Keep it Simple.

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Concurrent Version System (CVS)

CVS Installation.

In order to setup a Concurrent Versioning System (CVS) server on the system, follow these steps:

1. Make a cvs user with a home directory as well as create a new group called cvs:

   groupadd cvs
   useradd cvs -g cvs
   

2. Create repository # cvs -d /usr/local/cvsroot init *** (my changes)
   

3. Change owner and group of repository and all files to cvs:

   chown -R cvs.cvs /usr/local/cvsroot  *****(my chages)

4. Set the CVSROOT variable. This will be /home/cvs since a cvs user was created and its home directory will be used. Set this variable in /etc/profile by adding the the following to the end of the file:

   export CVSROOT=/home/cvs
   

5. Then set the permissions for /usr/bin/cvs so it can be executed at startup:

   chmod 2755 /usr/bin/cvs
   

6. Finally, add the following to the file /etc/xinetd.d/cvspserver

   service cvspserver
   {
          disable            = no
          socket_type    = stream
          wait                = no
          user                = cvs
          group              = cvs
          log_type          = FILE /var/log/cvspserver
          protocol          = tcp
          env                 = '$HOME=/home/cvs'
          bind                = 10.10.10.10
          log_on_failure  += USERID
          port                = 2401
          server             = /usr/bin/cvs
          server_args     = -f --allow-root=/usr/local/cvsroot pserver
   }
   

   Note: On the line that states the bind IP address: "bind = 10.10.10.10", replace "10.10.10.10" with the IP address to be used.
   
7. Make sure restart service : service xinetd restart or /etc/rc.d/rc5.d/S56xinetd restart
8. Check the CVS using the following command telnet 2401 or check port open with Brut (port scanning tool)
9. Add the users allowed to access the cvs into the cvs group by doing the following:

   make passwd file in usr/local/cvsroot/CVSROOT/passwd

10. add user with htpasswd command & make sure with cvs group. passwd file format is username:passwd:group
    

11. To access this CVS server from another computer, do the following:

    export CVSROOT=:pserver:abc@*.*.*.*:/usr/local/svcroot
    cvs login

Another command which i used.

import project (1st time)

#cvs -d /usr/local/cvsroot import samba(my e.g) samba21072008 start

#ls -l /usr/local/current/samba

now move or delete project (samba) to avoide bypass.

#pwd
/etc/samab/
#cd ..
#cvs co samba

now u can work on /etct/samba

after do chages in any files run

#cvs checkout samba

#cvs update

# cvs commit ( for parmament save and add ur comment)

for see changes u can use this command.

#cvs -nq update


How add dir and files in cvs.

suppose u work in /etc/samba/

#mkdir new
#cvs add new

Message show /usr/local/cvsroot/samaba/new added to repository.


For add any file.
# cd new
#touch a.text
#cvs add a.txt (use * for multiple text file)
#cvs update
#cvs commit (add ur comment)

now your text file sucessfully added in repository.



help full links are ( www.in.redhat.com,http://www.taursys.com/howto/cvs/,http://www.idevelopment.info/)

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Recover / Changes Root password in Mysql

First stop the mysql service.
#/etc/init.d/mysqld stop
start server mysql without password.
#mysqld_safe --skip-grant-tables &
#mysql -u root
mysql > use mysql;
mysql > update user set password=passwd(******) where user="root";
>flush privileges;
>quit;

Now start the services.
#/etc/init.d/mysqld start
Now you can login with new passwd.
#mysql -u root -p

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Script for Tar your backup and SCP

Use this script as it is as..only chage ur host and backup location.

vi backup.sh (give it exectuable permission )
#chmod 755 backup.sh (for execute)

vi backup.sh
HOST=1.2.3.4
USER=root
PASSWD=*******
DATE=`/bin/date +%Y%m%d`
TIME=`/bin/date +%H`
HOSTNAME=`/bin/hostname`
#mysqldump -c -B -uroot -pfoobar DB1 DB2 mysql > data.sql && (in case if u use mysql database ) in my case i am not use so use # (disable)
tar zcvf $DATE.$TIME.$HOSTNAME.tar.gz /tmp > /dev/null && (i use /tmp dir which i used for my backup)
scp *.tar.gz $HOST:/home/raman/ (remot path)
#$DATE.$TIME.$HOSTNAME.tar.gz ;: (disable)

Just drop me a mail if you face any problem.....at..... raman38192@gmail.com

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SSH and SCP Without Password

SSH and scp without password.


Make sure id_rsa.pub key available in your destination.

For eg. you connect A to B

Run
#ssh-keygen -t rsa (A box)

Generated keys in /root/.ssh dir

copy id_rsa.pub key

and paste it in box B.

make sure /root/.ssh/authorized_keys file is avaialble if not u create it manually.

and paste in this file.


Now u can login in box without asking a password.

Hope this doc work for you.

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