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Monday, April 28, 2014

SVN-Subversion installation and configuration

 

Installing SVN

yum install mod_dav_svn subversion
Add it in httpd conf or in httpd/conf.d/subversion.conf

LoadModule dav_svn_module modules/mod_dav_svn.so
LoadModule authz_svn_module modules/mod_authz_svn.so

<Location /svn>
DAV svn
SVNParentPath /var/www/svn
AuthType Basic
AuthName "Subversion repositories"
AuthUserFile /etc/svn-auth-users
Require valid-user
</Location>

Creating User for accessing the SVN

htpasswd -cm /etc/svn-auth-users user1
New password:
Re-type new password:
Adding password for user user1

## Create user2 ##
htpasswd -m /etc/svn-auth-users user2
New password:
Re-type new password:
Adding password for user user2

Creating the directories and correcting permissions

mkdir /var/www/svn
cd /var/www/svn

Creating repositories

svnadmin create testrepo
chown -R apache.apache testrepo


## If you have SELinux enabled (you can check it with "sestatus" command) ##
## then change SELinux security context with chcon command ##

chcon -R -t httpd_sys_content_t /var/www/svn/testrepo

## Following enables commits over http ##
chcon -R -t httpd_sys_rw_content_t /var/www/svn/testrepo

or else disable the selinux
setenforce 0
Restart the service

systemctl restart httpd.service
## OR ##
service httpd restart

## CentOS / RHEL ##
/etc/init.d/httpd restart
## OR ##
service httpd restart

 

Friday, April 25, 2014

Linux Acl in detail

Let's assume we have /dev/sda1 mounted on /data1 and we want to enable the acl option.

[root@server ~]# tune2fs -l /dev/sda1
To enable ACLs on a filesystem, we must set the fs default and remount:
[root@server ~]# tune2fs -o acl /dev/sda1
[root@server ~]# mount -o remount,acl /data1
Use getfacl to view ACLs:

[root@server ~]# touch /data1/foo.txt
[root@server ~]# getfacl /data1/foo.txt
getfacl: Removing leading '/' from absolute path names
# file: data1/foo.txt
# owner: root
# group: root
user::rw-
group::r--
other::r--
Use setfacl to set ACLs, with -m to modify and -x to remove a given ACL.
give user ram read+write+execute on a file:

[root@server ~]# setfacl -m u:ram:rwx /data1/foo.txt
give group peeps read+write on a file:
[root@server ~]# setfacl -m g:peeps:rw /data1/foo.txt
remove ram's ACL permissions:
[root@server ~]# setfacl -x u:ram /data1/foo.txt
set the default ACL permissions on a directory:
[root@server ~]# setfacl -m d:g:peeps:rw /data1/stuff/
revoke write permission for everyone:
[root@server ~]# setfacl -m m::rx /data1/foo.txt
When ACLs are present, an ls -l will show a plus sign to notify you:

[root@server ~]# ls -l /data1/foo.txt
-rw-rwxr--+ 1 root root 0 Dec 3 14:54 /data1/foo.txt
Note that the mv and cp -p commands will preserve ACLs. If you have defaults set on a parent directory, new files in that directory will inherit those settings.
If you want to remove all ACLs, reverting back to the base unix permissions of owner, group and other:

[root@server ~]# setfacl --remove-all /data1/foo.txt

Thursday, April 24, 2014

Flush Your Local DNS Cache

 

Windows Vista/Windows 7:
ipconfig /flushdns
Successfully flushed the DNS Resolver Cache.

Windows XP
ipconfig /flushdns
Successfully flushed the DNS Resolver Cache.

Mac OS X 10.5.2 and above
dscacheutil -flushcache

Mac OS X 10.5.1 and below
Click on the Finder icon in your dock. Open your Applications folder.
Inside the Applications folder, click on Utilities and then Terminal.
Type the following command in the Terminal window and press Enter:
lookupd -flushcache

Linux

nscd -i hosts
– Clear local DNS cache for current user.
nscd -I hosts
– Clear local DNS cache for all users.