All processes belonging to the same guest are treated like “noop” within the guest. It’s not possible to set a scheduler strategy within a guest. Think every guest is treated like a own process group. The default is tgid, which means to share fairly among process groups. So: If you run apache and some ftp-server within the _same_ guest, there is no fair scheduling between them, but there is fair scheduling between the whole guest and all other guests.
Now we already have enough knowledge to install and configure cluster packages for two nodes and enable fencing and failover in a clustered environment. As we many of you have completed all three previous parts, I will brief you what we have completed so far.
Cfg for my config file and it failed. I tried using autostart. All the commands and settings I posted worked on Fedora 17 x64. Rpm’s and distribution’s tend to change locations and settings from what the developer creates. D/vboxautostart-service on Fedora 17 and that’s what worked for me. It looks like you are using either CentOS or RHEL derivative and they are different than Fedora which is bleeding edge. I will try the installs on CentOS 6 and see what I get with the package and config but I am betting it is what you saw. Cfg is what is listed in /etc/init. The autostart enabled switch in post looks like a single dash but it is two dashes and WordPress can sometimes mash things together.
Aptitude is a text-based frontend for APT that makes it easier to browse through packages, search, and manage them. In previous posts, we have examined some of the features of APT, the Debian package management system, and learned how to install, update, and remove packages. While APT operates completely from the command line, Aptitude uses .
Running an unmanaged server is a lot of work. Fortunately for you, Linux community support is . In a previous post, we looked at options for paid support for Linux servers, but with a limited budget, paid support might not be an option you can even consider. There is really only one other alternative: community support.
Most Linux distributions have gradually migrated away from System V or on their way to phasing it out, keeping it only for backward compatibility. Older versions of Debian use SysVinit too. FreeBSD, a variant of UNIX, uses a different implementation of System V, known as BSD init.
Let’s say there is a VirtualBox VM you start everytime you startup your system, why not make it startup as soon as you start VirtualBox. A new feature added in VirtualBox 4. 2 is autostart, this feature is available in Linux, Solaris and MacOSX hosts only. I am using Fedora 17 for this example.
If [ “$system” = “other” ]; then
if [ -n “$NOLSB” ]; then
echo ” fail. ”
echo -n “”
echo ” done.
Pingback: Install SNMP Service/Daemon on CentOS – blog tlfhost(). It will prevent the continual log chatter on every single connection.
I haven’t started writing it yet, but in going through and securing my own servers, I’ve realized that there is still quite a bit I was missing (sulogin vs sushell in single user mode, for example)
So, what I will do is I will start documenting this stuff on my site and I will provide a single link (in the next post) to my site. Feel free to begin following the posts there. I just found that it will be easier to break this up into smaller, more manageable chunks, and with the fact that I have a limited number of reserved posts, I didn’t feel I could reasonably do this series the justice it deserves by keeping it here. I know Rackspace for sure does have some additional steps you should take”. I’ve decided that the rest of this series is going to be better posted as a blog on my site. I do definitely appreciate the input of Russell with respect to the single user mode quirks, and I will be sure to note things like that in the blog posts, albeit in a much more general format, such as “Contact your host if you are running a cloud server to ensure this step has no quirks. Apologies for all of the build up leading to this.
In System V, a service could start in particular runlevels, but it also could be made to wait until another service or resource became available. As we saw before, Upstart ensures parallel loading of services using configuration files. In similar fashion, systemd services can be made to load in one or more targets, or wait until another service or resource became active.
If you happen to use a Hadoop distribution such as Cloudera CDH4 you can use the respective management tool (Cloudera Manager in the case of CDH4) to easily install a single-node or a multi-node ZooKeeper cluster. You can either follow the official ZooKeeper instructions for deploying a ZK cluster, which will require you to install ZK from a release tarball, or you can fall back to pre-built RPMs for RHEL6/CentOS6. If you don’t want to go down the management tool route you can install ZooKeeper manually.