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docs: Add RUST_LOG explainer

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This commit is contained in:
Trent Nelson
2021-01-07 12:10:24 -07:00
committed by mergify[bot]
parent c035f2a745
commit 30038a8849
1 changed files with 13 additions and 2 deletions
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15
docs/src/running-validator/validator-start.md
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@ -336,7 +336,18 @@ Start the service with:
$ sudo systemctl enable --now sol
```
### Log rotation
### Logging
#### Log output tuning
The messages that a validator emits to the log can be controlled by the `RUST_LOG`
environment variable. Details can by found in the [documentation](https://docs.rs/env_logger/latest/env_logger/#enabling-logging)
for the `env_logger` Rust crate.
Note that if logging output is reduced, this may make it difficult to debug issues
encountered later. Should support be sought from the team, any changes will need
to be reverted and the issue reproduced before help can be provided.
#### Log rotation
The validator log file, as specified by `--log ~/solana-validator.log`, can get
very large over time and it's recommended that log rotation be configured.
@ -344,7 +355,7 @@ very large over time and it's recommended that log rotation be configured.
The validator will re-open its when it receives the `USR1` signal, which is the
basic primitive that enables log rotation.
### Using logrotate
#### Using logrotate
An example setup for the `logrotate`, which assumes that the validator is
running as a systemd service called `sol.service` and writes a log file at