In this post, how to unified Linux login and home directory using OpenLDAP and NFS/automount will be introduced. 0. System environment This solution is tested on Fedora 12 systems and CentOS 5. LDAP and NFS server: IP: 10.0.0.2 OS: Fedora 12 x86_64 ldap base dn: “dc=lgcpu1″ Clients: IP: 10.0.0.1/24 OS: Fedora 12 x86_64 1. LDAP…
The socks proxy I created following Proxy Using SSH Tunnel works very well on both Linux and Windows. However, when I try to configure my iPhone and iPad with iOS, I find iOS does not support socks proxy in its settings interface. I don’t know why it is not added while socks proxy is indeed…
This article is an instruction of how to use https://www.systutorials.com/proxy-using-ssh-tunnel/ on a Windows machine. The mechanism is similar as the one in https://www.systutorials.com/proxy-using-ssh-tunnel/ with “Proxy listening to localhost port only”. Download PuTTY PuTTY is the software we use here for port forwarding. Please download it following the links in https://www.systutorials.com/open-source-and-portable-ssh-scp-sftp-and-vnc-clients-for-windows-to-remote-control-linux/. Configure PuTTY and create a…
It is useful sometimes to set up a sshd server on a Windows. One example is using remote forwards tunnel to pass through the firewall. My platform is Windows XP SP3. The sshd server is sshwindows. It can be dowloaded from here: http://sshwindows.sourceforge.net/ . The version I use here is 3.8p1-1 20040709. It is really…
If you want to have a wordpress blog for FREE co.cc + x10hosting is the best choice. I will introduce both in this post. I will briefly introduce how to set up a wordpress blog like my blog. The overall that I paid for this blog is only $0.89. I can say that it is…
The font size of WordPress’s visual editor is too small for me on my screen display. The default font size is 13px which is hard for my eye on my screen. There are two ways to change the default font size in the visual editor. One is changing WordPress’s css file for the editor while…
WordPress may show “duplicate” content which may potentially confuse search engines. Duplicate content won’t hurt much, unless it is spam or keyword stuffing, as said by Matt Cutts, and Google may just ignore the duplicate content. However, instead of letting the search engines decide which pages of the duplicate ones are important, we may only…
The apache’s default “404 Error not found” page seems ugly. And may some hosting service put theire ads in it. We can add some entry in .htaccess to change the defualt 404 error page. This method can also be used for some other error codes. A list of the server returned codes can be found…
I want to move the sub domain blog.pkill.info to systutorials.com permanently. I can manage all the pages I want to post using WordPress. Changing domain in a bad way is dangerous. Put a page the tell the reader that the site is moved to a new domain is very unfriendly to the user and also…
Shutting down servers is a common operations for managing a cluster. However, if this server is configured to a Xen Dom0 and has Xen VMs (DomUs), the VMs should be shutdown first to avoid data lost on these VMs. xm supports a -a option to shutdown all VMs: # xm shutdown -a Add the -w…
With a list of servers, it is common that one or more are down or crash. Lots cluster management tools can detect the aliveness of servers. However, it can be easily done with ping with a Bash script. I summarize the script that I used and share it here: check-alive-server.sh. Usage: usage: ./check-alive-server.sh file Each…
We introduced how to create a LVM group with two hard disk partitions, which the LVM group can be used for [[setting-up-lvm-backed-xen-domu|installing LVM backed Xen DomUs]]. The LVM volume can have large capacity from several hard disks. However, we may use all the disk space after some time and we may need to extend the…
ns is a discrete-event network simulator targeted primarily for research and educational use. There are two version of ns, ns-2 and ns-3, which are quite different with each other in the implementation and method to use them. In this post, we introduce how to install ns-2 and ns-3 on Fedora Linux 15. Install ns-2.34 on…
NFS is widely deployed and used even after more than twenty year. NFS is easy to set up and easy to use. This introduces how to set up the NFS server and clients. We use the Fedora system as the example. The tutorial here is for RHEL/CentOS/Fedora and derived Linux OSes. Set up an NFS…
This post is a tutorial for new users to set up git and clone and use the first repository. This post introduces how to start using git for new users. This post does not introduce details of how to use git commands. Please refer to the git manual or other tutorials for how to commit,…
How to find out Linux and Windows uptime is introduced in this post. Linux uptime Linux uptime can be easily found out by the uptime command: $ uptime 22:19:29 up 10 days, 22:26, 5 users, load average: 0.00, 0.00, 0.00 The system is up for 10 days, 22 hours and 26 minutes. uptime gives a…
ssh, scp, sftp and vnc are frequently used tools (both servers and clients) on Linux. We may want to remote control a Linux box from Windows such as when we make demostration in a meeting while our work are done on the Linux box. There are lots open source SSH, SCP, SFTP and VNC clients for…
Fedora’s font rendering isn’t very nice. At least on my laptop with Fedora 12. Bytecode Interpreter (BCI for short) is disabled by default because of patent issues. As the TrueType bytecode patents have expired. We may enable BCI in Fedora now. TrueType announced that BCI is enabled by default from 2.4. Fedora 12’s TrueType version…
How to create a LVM group from two hard disk partitions is introduced in this post. Assume we have installed two hard disks /dev/sdb and /dev/sdc to the server, our task now is to create one LVM volume group vg_xen for installing LVM backed Xen DomUs from these two disks. We will do this by…
LVM’s snapshot feature enables us to duplicate an LVM backed Xen DomU in seconds inside of the same volume group. When we want to duplicate LVM backed Xen DomU from a remote server, we need to make use of LVM’s snapshot function and tools like scp and dd. Backing up the DomU is only part…