91 lines
2.1 KiB
Plaintext
91 lines
2.1 KiB
Plaintext
---
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layout: "docs"
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page_title: "Commands: alloc logs"
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sidebar_current: "docs-commands-alloc-logs"
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description: >
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Stream the logs of a task.
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---
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# Command: alloc logs
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**Alias: `nomad logs`**
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The `alloc logs` command displays the log of a given task.
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## Usage
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```
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nomad alloc logs [options] <allocation> <task>
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```
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This command streams the logs of the given task in the allocation. If the
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allocation is only running a single task, the task name can be omitted.
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Optionally, the `-job` option may be used in which case a random allocation from
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the given job will be chosen.
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#
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## General Options
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<%= partial "docs/commands/_general_options" %>
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## Logs Options
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* `-stderr`: Display stderr logs.
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* `-verbose`: Display verbose output.
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* `-job`: Use a random allocation from the specified job, preferring a running
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allocation.
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* `-f`: Causes the output to not stop when the end of the logs are reached, but
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rather to wait for additional output.
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* `-tail`: Show the logs contents with offsets relative to the end of the logs.
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If no offset is given, -n is defaulted to 10.
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* `-n`: Sets the tail location in best-efforted number of lines relative to the
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end of the logs.
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* `-c`: Sets the tail location in number of bytes relative to the end of the logs.
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## Examples
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```
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$ nomad alloc logs eb17e557 redis
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foobar
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baz
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bam
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$ nomad alloc logs -stderr eb17e557 redis
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[ERR]: foo
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[ERR]: bar
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$ nomad alloc logs -job example
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[ERR]: foo
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[ERR]: bar
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$ nomad alloc logs -tail -n 2 eb17e557 redis
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foobar
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baz
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$ nomad alloc logs -tail -f -n 3 eb17e557 redis
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foobar
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baz
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bam
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<blocking>
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```
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## Using Job ID instead of Allocation ID
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Setting the `-job` flag causes a random allocation of the specified job to be
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selected. Nomad will prefer to select a running allocation ID for the job, but
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if no running allocations for the job are found, Nomad will use a dead
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allocation.
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```
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nomad alloc logs -job <job-id> <task>
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```
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Choosing a specific allocation is useful for debugging issues with a specific
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instance of a service. For other operations using the `-job` flag may be more
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convenient than looking up an allocation ID to use.
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