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instructions on adding new per-node dirs

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ahrenholz 2009-06-24 17:25:54 +00:00
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wiki/LinuxOpenVZTemplateCreation.wiki
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@ -74,6 +74,36 @@ ln -s /root/boot.conf Quagga.conf
* note that the symbolic link targets `/root/var/run` etc. do not exist on the host, the links will appear broken; that is normal. Once the container is started by CORE, the `/root` directory will be mounted from `/tmp/n0` as described above
* if you have other applications that require per-node state or configuration, modify the `core-root` with the appropriate symbolic links. You can update the `vzprep.sh` script to build the appropriate directories in `/tmp/n0` as needed.
# Now that you are done building the core-root, you may want to tar up your work to have a snapshot to fall back to, or to copy to other CORE machines. Read the next section about building an RPM for these reasons.
= How to setup a per-node directory =
The `core-root` filesystem is shared, but some directories unique to each node, as described above. Suppose you want to add a new directory that is different on each node, for storing configuration files for example:
{{{
/vz/private/core-root/usr/local/etc -> /root/usr/local/etc
}}}
*Note:* all of these commands are performed on the host node, *not* from within the virtual container.
# Remove the real directory from `core-root` if it already exists
{{{
# rm -rf /vz/private/core-root/usr/local/etc
}}}
# Create a symbolic link for the directory in the `core-root`. Note that it does not really exist on the host node so the link appears broken.
{{{
# ln -s /root/usr/local/etc /vz/private/core-root/usr/local/etc
}}}
# Add the new per-node directory to the `vzprep.sh` script (which is executed by CORE upon node creation)
{{{
...
# create a new, empty temporary area
mkdir -p /tmp/n$1
mkdir -p /tmp/n$1/var/run/quagga
mkdir -p /tmp/n$1/var/log
mkdir -p /tmp/n$1/usr/local/etc # <== added this line
}}}
# Now you need to add the new directory to existing nodes, or destroy them and allow CORE to recreate them.
{{{
for i in 0 1 2 3 4 5 6 7 8 9; do mkdir -p /tmp/n$1/usr/local/etc; done
}}}
= How to make the core-root RPM =
The core-root RPM is maintained separately from the CORE program RPM, due to its large size and to allow experimenting with different core-root environments. Once you have created a `/vz/private/core-root` directory tree using the steps above, follow these steps for making an RPM:
@ -87,4 +117,4 @@ The core-root RPM is maintained separately from the CORE program RPM, due to its
{{{
make core-root-rpm
}}}
# the successful rpmbuild should result in `/usr/src/redhat/RPMS/core-root-n.n-1.i386.rpm`
# the successful rpmbuild should result in `/usr/src/redhat/RPMS/core-root-n.n-1.i386.rpm`