Type5 : All the above commands will ask password to display/mount the share name, however we can specify the password in command itself as below
8 Ways To Mount SMBfs (SAMBA FILE SYSTEM) In Linux.
0 comments 9/08/2009 08:22:00 AM Posted by Surendra Kumar AnneLabels: File Sharing Servers, Servers
Type5 : All the above commands will ask password to display/mount the share name, however we can specify the password in command itself as below
RSYNC --The tool every Admin should know
0 comments 8/24/2009 01:28:00 AM Posted by Surendra Kumar AnneLabels: Administration, Backup/Restore-Mgmt, File Sharing Servers, How-To's, Tutorials
Let us list advantages of this command then we will know how to configure it.
Advantages of rsync :
- This tool will keep both the destination and source folder synced.
- rsync is fast, because it will not copy entire data every time it got synced, it just copes the date which got changed from previous copy.
- For security reasons, rsync will support ssh to transfer data between two machines.
- rsync is used to download RPM updated repository to local machine.
Configuration : rsync
Some points to be remembered when dealing with rsync
- This utility is the part of xinetd so there is no special package for this.
- When we are doing rsync between two systems, both the systems should be configured to allow rsync connections.
- rsync uses 873.
#yum install xinetd
Step2 : Configure rsync to allow connections, the configuration file for rsync is located in /etc/xinetd.d
#cd /etc/xinetd.d
#vi rsync
# default : off
# description: The rsync server is a good addition to an ftp server, as it \
# allows crc checksumming etc.
service rsync
{
disable = yes
socket_type = stream
wait = no
user = root
server = /usr/bin/rsync
server_args = --daemon
log_on_failure += USERID
}
In this configuration file just change disable = yes to no, then save the file and exit. Here is the updated configured file.
# description: The rsync server is a good addition to an ftp server, as it \
# allows crc checksumming etc.
service rsync
{
disable = no
socket_type = stream
wait = no
user = root
server = /usr/bin/rsync
server_args = --daemon
log_on_failure += USERID
}
Step3 : Start the rsync service, so how to do it? As i mention earlier that rsync is a part of xinetd service so just restart the xinetd service.
#service xinetd restart
Step4 : Permanently on the service
#chkconfig rsync --levels 345 on
Same configurations should be done on the other system too, in order to rsync executed properly.
Server configuration file syntax Checking commands
2 comments 7/01/2009 09:58:00 PM Posted by Surendra Kumar AnneLabels: Advanced Servers, DNS Servers, File Sharing Servers, Mail Servers, Server Troubleshooting, Web Servers
SERVER CONFIGURATION FILE SYNTAX CHECKING COMMANDS.
I have planned to write this post some long time ago, now the time has come to do it.
Basically configuring servers in Linux/*nix include editing of configuration files and saving them. Once editing the files if any syntax error is there and when we start the service they will show some wearied errors which we cant resolve.
For counter attacking this type of issues for each service there will be one command to check this syntax errors before starting of the service/server, I have collected these commands from my experience and from some of my friends. Please feel free to comment on this if you know some other commands so that I will update my post.
SSHD server check for syntax error
=========================
sshd -t
FTP server check for syntax error
=========================
#vsftpd
DNS server check for syntax error
==========================
For checking syntax errors in main configuration file..
#named-checkconf main-config-file
Example:
#named-checkconf named.conf
Syntax OK
#named-checkzone domain zonefile-loc
Example:
#named-checkzone example.com /var/named/chroot/var/named/exaple-zone.frd
SAMBA server check for syntax error
=============================
#testparm
APACHE server check for syntax error
=============================
httpd -t
For virtual hosts
httpd -t -D DUMP_VHOSTS
TCP Wrappers check for syntax error
============================
tcpdchk
tcpdchk -v
Postfox server check for syntax error
============================
postfix check
postfix -vv
LIGHTTPD server check for syntax error
=============================
lighttpd -t -f /etc/lighttpd/lighttpd.conf
Squid server check for syntax error
==========================
squid -k check
squid -k parse
/usr/local/nagios/bin/nagios -v /usr/local/nagios/etc/nagios.cfg
Linux interview questions :FTP
6 comments 6/18/2009 05:08:00 AM Posted by Surendra Kumar AnneLabels: File Sharing Servers, INTERVIEWS
LINUX INTERVIEW QUESTIONS : FTP
One of my friend asked me why there is no answers for So many interview questions, basically most of the interview questions which are on this site are the interviews which happened to me so. At that time I am not able to Answer some of the questions, so from today on words I will try to post all the interview questions with answers, If you feel these answers are wrong you can feel free to comment with proof so that i can modify my posts.
1)What is the difference between TFTP and FTP servers?
A)Both are file transfer servers but slight difference is TFTP server uses UDP protocol and FTP uses TCP protocol. TFTP is good for slow connection paths.
2)What is the port no for FTP?
A)20 for Data and 21 for Control(normally when an interviewer ask's ftp port number just say 21.
3)What is the port no for TFTP?
A)69.
4) How to restrict users to their home directories?
A)By setting up "chroot_local_user=YES".
5)How to restrict total number of users accessing FTP server?
A1) If Vsftpd is running under xinted service, then you can use xineted to get per-service per IP connection limits or
A2) If you run vsftpd in "standalone" mode with the "setting listen=YES", then
you can investigate the setting (e.g.) : "max_clients=10"
6)I want to copy multiple files with out prompting for any info, how can I do that one?
A)Simply do "ftp -i ftpserver" this command will suppress any info displayed on ftp server.
or you can just type prompt ftp prompt to suppress info messages have a look here.
7) Some times Local users cannot log in. How to resolve this issue?
A) Check "local_enable=YES" in your /etc/vsftpd/vsftpd. conf to allow local users to log in.
8) How do we integrate with LDAP( Lightweight Directory Access Protocol )users and login?
A) Use vsftpd's( Very Secure FTPD) PAM(Pluggable Authentication Modules) integration to do this, and have PAM authenticate against an LDAP repository.
9) Can we host different ftp sites on single machine, I mean virtual hosting concept like Apache?
A1) Yes. If you integrate vsftpd with xinetd, you can use xinetd to bind to several different IP addresses. For each IP address, get xinetd to launch vsftpd with a different config file. This way, you can get different behavior per virtual address.
A2) Alternatively, run as many copies as vsftpd as necessary, in standalone
mode. Use "listen_address=x.x.x.x" to set the virtual IP.
10) How to restrict different users with different permissions in vsftpd
A) By setting up "user_config_dir" entry in "vsftpd.conf".
11)How to change vsftpd default port?
A)By setting "listen_port" option in "vsftpd.conf".
12) Vsftpd is reporting times as GMT times and not local times!. How to resolve this?
A) This behavior can be changed with the setting "use_localtime=YES".
13) How to disable certain FTP commands?
A) There are some individual settings (e.g. dirlist_enable) or you can specify a complete set of allowed commands with "cmds_allowed".
14) How does vsftpd support per-IP limits?
A1) If you are running vsftpd standalone, there is a "max_per_ip" setting.
A2) Yes. If you are running vsftpd via xinetd, there is an xinetd config variable "per_source".
15) How Does vsftpd can do bandwidth limiting?
A) settings such as "anon_max_rate" and "local_max_rate" can be used to set this limits.
16) How to restrict some IP's not use my FTP server?
A1) vsftpd can integrate with tcp_wrappers (if built with this support). It is enabled with the setting "tcp_wrappers=YES".
17) Does vsftpd support IPv6?
A) Yes, as of "version 1.2.0".
18) Help! I'm getting messages along the lines of "500 OOPS: vsf_sysutil_bind" when trying to do downloads (particularly lots of small files).
A) "vsftpd-1.2.1" should sort this out.
19) Can we use vsftpd to hiding or denying certain files?
A) Yes. Look at the hide_file and deny_file options.
20)How you can check if there is any syntax error in vsftpd.conf file?
A)Just type vsftpd with out quoats.


