For some time, we defined a minimum limit for `--memory` limits to account for
overhead during startup, and to supply a reasonable functional container.
Changes in the runtime (runc) introduced a higher memory footprint during container
startup, which now lead to obscure error-messages that are unfriendly for users:
run --rm --memory=4m alpine echo success
docker: Error response from daemon: OCI runtime create failed: container_linux.go:349: starting container process caused "process_linux.go:449: container init caused \"process_linux.go:415: setting cgroup config for procHooks process caused \\\"failed to write \\\\\\\"4194304\\\\\\\" to \\\\\\\"/sys/fs/cgroup/memory/docker/1254c8d63f85442e599b17dff895f4543c897755ee3bd9b56d5d3d17724b38d7/memory.limit_in_bytes\\\\\\\": write /sys/fs/cgroup/memory/docker/1254c8d63f85442e599b17dff895f4543c897755ee3bd9b56d5d3d17724b38d7/memory.limit_in_bytes: device or resource busy\\\"\"": unknown.
ERRO[0000] error waiting for container: context canceled
Containers that fail to start because of this limit, will not be marked as OOMKilled,
which makes it harder for users to find the cause of the failure.
Note that _after_ this memory is only required during startup of the container. After
the container was started, the container may not consume this memory, and limits
could (manually) be lowered, for example, an alpine container running only a shell
can run with 512k of memory;
echo 524288 > /sys/fs/cgroup/memory/docker/acdd326419f0898be63b0463cfc81cd17fb34d2dae6f8aa3768ee6a075ca5c86/memory.limit_in_bytes
However, restarting the container will reset that manual limit to the container's
configuration. While `docker container update` would allow for the updated limit to
be persisted, (re)starting the container after updating produces the same error message
again, so we cannot use different limits for `docker run` / `docker create` and `docker update`.
This patch raises the minimum memory limnit to 6M, so that a better error-message is
produced if a user tries to create a container with a memory-limit that is too low:
docker create --memory=4m alpine echo success
docker: Error response from daemon: Minimum memory limit allowed is 6MB.
Possibly, this constraint could be handled by runc, so that different runtimes
could set a best-matching limit (other runtimes may require less overhead).
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Use strongly typed errors to set HTTP status codes.
Error interfaces are defined in the api/errors package and errors
returned from controllers are checked against these interfaces.
Errors can be wraeped in a pkg/errors.Causer, as long as somewhere in the
line of causes one of the interfaces is implemented. The special error
interfaces take precedence over Causer, meaning if both Causer and one
of the new error interfaces are implemented, the Causer is not
traversed.
Signed-off-by: Brian Goff <cpuguy83@gmail.com>
99.9% of use case for request call are using daemonHost. This makes it
default and adds a `request.DoOnHost` function to be able to specify
the host for specific, more complex use cases.
Signed-off-by: Vincent Demeester <vincent@sbr.pm>
`request.SockRequestRaw` is deprecated, let's use appropriate methods
for those. This is a first pass, `SockRequest` still needs to be removed.
Signed-off-by: Vincent Demeester <vincent@sbr.pm>
The goal is to remove function from `docker_utils.go` and setup
simple, one-responsability package that can be well tested ; and to
ease writing request.
This moves all the calls to `sockRequest` (and similar methods) to
their counterpart in the `request` package.
This introduce `request.Do` to write easier request (with functional
argument to easily augment the request) with some pre-defined function
for the most used http method (i.e. `request.Get`, `request.Post` and
`request.Delete`).
Few of the `sockRequest` call have been moved to `request.Do` (and
`Get`, etc.) to showcase the usage of the package. There is still a
whole lot to do.
Signed-off-by: Vincent Demeester <vincent@sbr.pm>
No substantial code change.
- Api --> API
- Cli --> CLI
- Http, Https --> HTTP, HTTPS
- Id --> ID
- Uid,Gid,Pid --> UID,PID,PID
- Ipam --> IPAM
- Tls --> TLS (TestDaemonNoTlsCliTlsVerifyWithEnv --> TestDaemonTLSVerifyIssue13964)
Didn't touch in this commit:
- Git: because it is officially "Git": https://git-scm.com/
- Tar: because it is officially "Tar": https://www.gnu.org/software/tar/
- Cpu, Nat, Mac, Ipc, Shm: for keeping a consistency with existing production code (not changable, for compatibility)
Signed-off-by: Akihiro Suda <suda.akihiro@lab.ntt.co.jp>
