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docs: Don't modify pristine config files

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Kata supports multiple configuration file locations, so update the dev
guide to tweak config settings in
`/etc/kata-containers/configuration.toml` rather than the pristine
`/usr/share/defaults/kata-containers/configuration.toml` file. The
former is read first meaning the system can be reset to a vanilla Kata
configuration by simply deleting
`/etc/kata-containers/configuration.toml`.

Signed-off-by: James O. D. Hunt <james.o.hunt@intel.com>
This commit is contained in:
James O. D. Hunt 2019-03-19 11:20:51 +00:00
parent c771f76eae
commit b347b3302c
1 changed files with 18 additions and 8 deletions
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26
Developer-Guide.md
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@ -112,18 +112,24 @@ If your system is *not* able to run Kata Containers, the previous command will e
Kata containers can run with either an initrd image or a rootfs image.
If you want to test with `initrd`, make sure you have `initrd = /usr/share/kata-containers/kata-containers-initrd.img`
in `/usr/share/defaults/kata-containers/configuration.toml` and comment out the `image` line with the following:
in your configuration file, commenting out the `image` line:
`/usr/share/defaults/kata-containers/configuration.toml` and comment out the `image` line with the following. For example:
```
$ sudo sed -i 's/^\(image =.*\)/# \1/g' /usr/share/defaults/kata-containers/configuration.toml
$ sudo mkdir -p /etc/kata-containers/
$ sudo install -o root -g root -m 0640 /usr/share/defaults/kata-containers/configuration.toml /etc/kata-containers
$ sudo sed -i 's/^\(image =.*\)/# \1/g' /etc/kata-containers/configuration.toml
```
You can create the initrd image as shown in the [create an initrd image](#create-an-initrd-image---optional) section.
If you want to test with a rootfs `image`, make sure you have `image = /usr/share/kata-containers/kata-containers.img`
in `/usr/share/defaults/kata-containers/configuration.toml` and comment out the `initrd` line with the following:
in your configuration file, commenting out the `initrd` line. For example:
```
$ sudo sed -i 's/^\(initrd =.*\)/# \1/g' /usr/share/defaults/kata-containers/configuration.toml
$ sudo mkdir -p /etc/kata-containers/
$ sudo install -o root -g root -m 0640 /usr/share/defaults/kata-containers/configuration.toml /etc/kata-containers
$ sudo sed -i 's/^\(initrd =.*\)/# \1/g' /etc/kata-containers/configuration.toml
```
The rootfs image is created as shown in the [create a rootfs image](#create-a-rootfs-image) section.
@ -136,8 +142,10 @@ rootfs `image`(100MB+).
Enable full debug as follows:
```
$ sudo sed -i -e 's/^# *\(enable_debug\).*=.*$/\1 = true/g' /usr/share/defaults/kata-containers/configuration.toml
$ sudo sed -i -e 's/^kernel_params = "\(.*\)"/kernel_params = "\1 agent.log=debug initcall_debug"/g' /usr/share/defaults/kata-containers/configuration.toml
$ sudo mkdir -p /etc/kata-containers/
$ sudo install -o root -g root -m 0640 /usr/share/defaults/kata-containers/configuration.toml /etc/kata-containers
$ sudo sed -i -e 's/^# *\(enable_debug\).*=.*$/\1 = true/g' /etc/kata-containers/configuration.toml
$ sudo sed -i -e 's/^kernel_params = "\(.*\)"/kernel_params = "\1 agent.log=debug initcall_debug"/g' /etc/kata-containers/configuration.toml
```
### journald rate limiting
@ -696,8 +704,10 @@ For the debug console to work, you **must** ensure that proxy debug is
not see any output when you connect to the virtual machine:
```
$ sudo awk '{if (/^\[proxy\.kata\]/) {got=1}; if (got == 1 && /^.*enable_debug/) {print "#enable_debug = true"; got=0; next; } else {print}}' /usr/share/defaults/kata-containers/configuration.toml > /tmp/configuration.toml
$ sudo install -o root -g root -m 0640 /tmp/configuration.toml /usr/share/defaults/kata-containers/configuration.toml
$ sudo mkdir -p /etc/kata-containers/
$ sudo install -o root -g root -m 0640 /usr/share/defaults/kata-containers/configuration.toml /etc/kata-containers
$ sudo awk '{if (/^\[proxy\.kata\]/) {got=1}; if (got == 1 && /^.*enable_debug/) {print "#enable_debug = true"; got=0; next; } else {print}}' /etc/kata-containers/configuration.toml > /tmp/configuration.toml
$ sudo install -o root -g root -m 0640 /tmp/configuration.toml /etc/kata-containers/
```
### Create a container