Get status of your servers with perl script.

Monitoring the servers could be well – “not difficult” but boring and monotonous. And since this is something that you should ideally do on daily basis, so why not have a script for the same.

You can’t possibly copy your ssh-keys to all the servers that you are monitoring, better if you can, then you need to do ssh to server with password. So, here is link to my github repo for monitoring servers with perl script. Preety straight forward script and you can schedule this in cron to get a daily mail.

Add ssh key to remote host

If you are working on recent versions of the *nix OS like Fedora or Ubuntu then you would know about the commad ssh-copy-id. But if you land up using one of the older versions like Solaris or something where the command is not present, then probably you need a simpler solution to this. One of the simplest solution is with a lot of assumtions, simply copy the id_rsa file to remote server and hope it works. And here is  a script to do just that:

ss – utility to investigate sockets.

Sometimes, you find some interesting application/command by accident, and that is just what happened a few days back. Well, I was doing a ssh and as usual made my share of mistake in typing and missed the “h” from the ssh command and saw a list of options instead of my prompt on remote server.

Now, that set me thinking and fond that its a very interesting command that comes with iproute on Fedoara, so if you want this command, then install iproute like this

client lanman auth is disabled error for samba

The error:

Server requested LANMAN password (share-level security) but ‘client lanman auth’ is disabled

is easily fixable. You just need to tell samba that client lanman auth is enabled. And here is how to do this:

If you are getting this error then add the following in the globals section of the samba configuration:

client lanman auth = Yes

Ensure that you change this in the file /etc/samba/smb.conf

OpenLDAP and SSL – some links

Here are some of the links that may be of great help to you if you are having issues with setting up SSL and OpenLDAP. I was having some issues with this setup and these links helped me fix the same.

http://www.faqs.org/docs/Linux-HOWTO/SSL-RedHat-HOWTO.html

http://www.tc.umn.edu/~brams006/selfsign_redhat.html

http://docs.redhat.com/docs/en-US/Red_Hat_Directory_Server/8.1/html/Using_Red_Hat_Console/Starting_the_Server_with_SSL_Enabled-Enabling_SSL_in_the_DS_Admin_Server_and_Console.html

http://directory.fedoraproject.org/wiki/Howto:SSL http://www.linuxtopia.org/online_books//network_administration_guides/ldap_administration/appendix-common-errors_Common_causes_of_LDAP_errors.html

Related articles

• Stephan Hermann: Ubuntu 10.04 LTS and OpenLDAP (shermann.name)
• Exploring LDAP SASL Authentication With Ruby (intridea.com)
• Stephan Hermann: [SOLVED] OpenLDAP, passwd and CRYPT passwords (shermann.name)
• Moodle – Slow LDAP Login (edugeek.net)

concatenate compressed and uncompressed logs

<span style="font-size: x-large;"><a href="http://feedproxy.google.com/~r/Command-line-fu/~3/iwFUyltYgjM/concatenate-compressed-and-uncompressed-logs">concatenate compressed and uncompressed logs

$ find /var/log/apache2 -name 'access.loggz' -exec <a class="zem_slink freebase/guid/9202a8c04000641f800000000001abd9" title="Gzip" rel="homepage" href="http://www.gzip.org/">zcat {} ; -or -name 'access.log' -exec cat {} ; This command allows you to stream your log files, including gziped files, into one stream which can be piped to <a class="zem_slink freebase/guid/9202a8c04000641f800000000000584b" title="AWK" rel="homepage" href="http://cm.bell-labs.com/cm/cs/awkbook/index.html">awk or some other command for analysis.

Note: if your version of &#8217;find&#8217; supports it, use:

find duplicate entry in a list in bash with sed

Here I will take an example of rss2email list, but I guess I will be able to pass on the concept.

Here is example of the output of the r2e list command:

1: http://blog.amit-agarwal.co.in/feed (default: amitag@localhost)
2: http://feeds2.feedburner.com/AllAboutLinux (default: amitag@localhost)
3: http://feeds2.feedburner.com/Command-line-fu (default: amitag@localhost)
4: http://blogs.members.freewebs.com/Members/Blogs/viewBlogRSS.jsp?userid=29731143 (default: amitag@localhost)

Target here is to get the list of all duplicate entries if any. So, first we need to remove the numbers from the begining and the email ID from the end.