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Clarify that swapaccounting warning only applies to Ubuntu and Debian (#4070)

This commit is contained in:
Misty Stanley-Jones 2017-08-01 16:43:28 -07:00
parent 314bb55b54
commit 2dc9a66f57
1 changed files with 13 additions and 12 deletions
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25
engine/installation/linux/linux-postinstall.md
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@ -363,23 +363,25 @@ To configure UFW and allow incoming connections on the Docker port:
### `Your kernel does not support cgroup swap limit capabilities`
You may see messages similar to the following when working with an image:
On Ubuntu or Debian hosts, You may see messages similar to the following when
working with an image.
```none
WARNING: Your kernel does not support swap limit capabilities. Limitation discarded.
```
If you don't need these capabilities, you can ignore the warning. You can
enable these capabilities in your kernel by following these instructions. Memory
and swap accounting incur an overhead of about 1% of the total available
memory and a 10% overall performance degradation, even if Docker is not running.
This warning does not occur on RPM-based systems, which enable these
capabilities by default.
1. Log into Ubuntu as a user with `sudo` privileges.
If you don't need these capabilities, you can ignore the warning. You can enable
these capabilities on Ubuntu or Debian by following these instructions. Memory
and swap accounting incur an overhead of about 1% of the total available memory
and a 10% overall performance degradation, even if Docker is not running.
2. Edit the `/etc/default/grub` file.
1. Log into the Ubuntu or Debian host as a user with `sudo` privileges.
3. Add or edit the `GRUB_CMDLINE_LINUX` line to add the following two key-value
pairs:
2. Edit the `/etc/default/grub` file. Add or edit the `GRUB_CMDLINE_LINUX` line
to add the following two key-value pairs:
```none
GRUB_CMDLINE_LINUX="cgroup_enable=memory swapaccount=1"
@ -387,7 +389,7 @@ memory and a 10% overall performance degradation, even if Docker is not running.
Save and close the file.
4. Update GRUB.
3. Update GRUB.
```bash
$ sudo update-grub
@ -396,8 +398,7 @@ memory and a 10% overall performance degradation, even if Docker is not running.
If your GRUB configuration file has incorrect syntax, an error will occur.
In this case, repeat steps 3 and 4.
6. Reboot your system. Memory and swap accounting are enabled and the warning
does not occur.
The changes will take effect when the system is rebooted.
## Next steps