100 lines
2.7 KiB
Markdown
100 lines
2.7 KiB
Markdown
---
|
|
layout: "docs"
|
|
page_title: "restart Stanza - Job Specification"
|
|
sidebar_current: "docs-job-specification-restart"
|
|
description: |-
|
|
The "restart" stanza configures a group's behavior on task failure.
|
|
---
|
|
|
|
# `restart` Stanza
|
|
|
|
<table class="table table-bordered table-striped">
|
|
<tr>
|
|
<th width="120">Placement</th>
|
|
<td>
|
|
<code>job -> group -> **restart**</code>
|
|
</td>
|
|
</tr>
|
|
</table>
|
|
|
|
The `restart` stanza configures a group's behavior on task failure. Restarts
|
|
happen on the client that is running the task.
|
|
|
|
```hcl
|
|
job "docs" {
|
|
group "example" {
|
|
restart {
|
|
attempts = 3
|
|
delay = "30s"
|
|
}
|
|
}
|
|
}
|
|
```
|
|
|
|
## `restart` Parameters
|
|
|
|
- `attempts` `(int: <varies>)` - Specifies the number of restarts allowed in the
|
|
configured interval. Defaults vary by job type, see below for more
|
|
information.
|
|
|
|
- `delay` `(string: "15s")` - Specifies the duration to wait before restarting a
|
|
task. This is specified using a label suffix like "30s" or "1h". A random
|
|
jitter of up to 25% is added to the delay.
|
|
|
|
- `interval` `(string: <varies>)` - Specifies the duration which begins when the
|
|
first task starts and ensures that only `attempts` number of restarts happens
|
|
within it. If more than `attempts` number of failures happen, behavior is
|
|
controlled by `mode`. This is specified using a label suffix like "30s" or
|
|
"1h". Defaults vary by job type, see below for more information.
|
|
|
|
- `mode` `(string: "fail")` - Controls the behavior when the task fails more
|
|
than `attempts` times in an interval. For a detailed explanation of these
|
|
values and their behavior, please see the [mode values section](#mode-values).
|
|
|
|
### `restart` Parameter Defaults
|
|
|
|
The values for many of the `restart` parameters vary by job type. Here are the
|
|
defaults by job type:
|
|
|
|
- The default batch restart policy is:
|
|
|
|
```hcl
|
|
restart {
|
|
attempts = 3
|
|
delay = "15s"
|
|
interval = "24h"
|
|
mode = "fail"
|
|
}
|
|
```
|
|
|
|
- The default service and system job restart policy is:
|
|
|
|
```hcl
|
|
restart {
|
|
interval = "30m"
|
|
attempts = 2
|
|
delay = "15s"
|
|
mode = "fail"
|
|
}
|
|
```
|
|
|
|
|
|
### `mode` Values
|
|
|
|
This section details the specific values for the "mode" parameter in the Nomad
|
|
job specification for constraints. The mode is always specified as a string
|
|
|
|
```hcl
|
|
restart {
|
|
mode = "..."
|
|
}
|
|
```
|
|
|
|
- `"delay"` - Instructs the scheduler to delay the next restart until the next
|
|
`interval` is reached.
|
|
|
|
- `"fail"` - Instructs the scheduler to not attempt to restart the task on
|
|
failure. This is the default behavior. This mode is useful for non-idempotent jobs which are unlikely to
|
|
succeed after a few failures. Failed jobs will be restarted according to
|
|
the [`reschedule`](/docs/job-specification/reschedule.html) stanza.
|