New flags in a `podman update` can change the configuration of HealthCheck when the container is started, without having to restart or recreate the container.
This can help determine why a given container suddenly started failing HealthCheck without interfering with the services it provides. For example, reconfigure HealthCheck to keep logs longer than the usual last X results, store logs to other destinations, etc.
Fixes: https://issues.redhat.com/browse/RHEL-60561
Signed-off-by: Jan Rodák <hony.com@seznam.cz>
These flags can affect the output of the HealtCheck log. Currently, when a container is configured with HealthCheck, the output from the HealthCheck command is only logged to the container status file, which is accessible via `podman inspect`.
It is also limited to the last five executions and the first 500 characters per execution.
This makes debugging past problems very difficult, since the only information available about the failure of the HealthCheck command is the generic `healthcheck service failed` record.
- The `--health-log-destination` flag sets the destination of the HealthCheck log.
- `none`: (default behavior) `HealthCheckResults` are stored in overlay containers. (For example: `$runroot/healthcheck.log`)
- `directory`: creates a log file named `<container-ID>-healthcheck.log` with JSON `HealthCheckResults` in the specified directory.
- `events_logger`: The log will be written with logging mechanism set by events_loggeri. It also saves the log to a default directory, for performance on a system with a large number of logs.
- The `--health-max-log-count` flag sets the maximum number of attempts in the HealthCheck log file.
- A value of `0` indicates an infinite number of attempts in the log file.
- The default value is `5` attempts in the log file.
- The `--health-max-log-size` flag sets the maximum length of the log stored.
- A value of `0` indicates an infinite log length.
- The default value is `500` log characters.
Add --health-max-log-count flag
Signed-off-by: Jan Rodák <hony.com@seznam.cz>
Add --health-max-log-size flag
Signed-off-by: Jan Rodák <hony.com@seznam.cz>
Add --health-log-destination flag
Signed-off-by: Jan Rodák <hony.com@seznam.cz>
Startup healthchecks are similar to K8S startup probes, in that
they are a separate check from the regular healthcheck that runs
before it. If the startup healthcheck fails repeatedly, the
associated container is restarted.
Signed-off-by: Matthew Heon <matthew.heon@pm.me>
For systems that have extreme robustness requirements (edge devices,
particularly those in difficult to access environments), it is important
that applications continue running in all circumstances. When the
application fails, Podman must restart it automatically to provide this
robustness. Otherwise, these devices may require customer IT to
physically gain access to restart, which can be prohibitively difficult.
Add a new `--on-failure` flag that supports four actions:
- **none**: Take no action.
- **kill**: Kill the container.
- **restart**: Restart the container. Do not combine the `restart`
action with the `--restart` flag. When running inside of
a systemd unit, consider using the `kill` or `stop`
action instead to make use of systemd's restart policy.
- **stop**: Stop the container.
To remain backwards compatible, **none** is the default action.
Signed-off-by: Valentin Rothberg <vrothberg@redhat.com>
Previously, if a container had healthchecks disabled in the
docker-compose.yml file and the user did a `podman inspect <container>`,
they would have an incorrect output:
```
"Healthcheck":{
"Test":[
"CMD-SHELL",
"NONE"
],
"Interval":30000000000,
"Timeout":30000000000,
"Retries":3
}
```
After a quick change, the correct output is now the result:
```
"Healthcheck":{
"Test":[
"NONE"
]
}
```
Additionally, I extracted the hard-coded strings that were used for
comparisons into constants in `libpod/define` to prevent a similar issue
from recurring.
Closes: #14493
Signed-off-by: Jake Correnti <jcorrenti13@gmail.com>
this commit fixes two bugs and adds regression tests.
when getting healthcheck values from an image, if the image does not
have a timeout defined, this resulted in a 0 value for timeout. The
default as described in the man pages is 30s.
when inspecting a container with a healthcheck command, a customer
observed that the &, <, and > characters were being converted into a
unicode escape value. It turns out json marshalling will by default
coerce string values to ut8.
Fixes: bz2028408
Signed-off-by: Brent Baude <bbaude@redhat.com>
Jan Rodák
Matthew Heon
Valentin Rothberg
Jake Correnti
Brent Baude