mirror of https://github.com/status-im/consul.git
77 lines
2.5 KiB
Plaintext
77 lines
2.5 KiB
Plaintext
---
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layout: docs
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page_title: Revert to BoltDB
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description: >-
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Learn how to revert Consul to the BoltDB backend after enabled the WAL (write-ahead log) LogStore backend shipped in Consul 1.15.
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---
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# Revert storage backend to BoltDB from WAL
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This topic describes how to revert your Consul storage backend from the experimental WAL LogStore backend to the default BoltDB.
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The overall process for reverting to BoltDB consists of the following steps. Repeat the steps for all Consul servers that you need to revert.
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1. Stop target server gracefully.
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1. Remove data directory from target server.
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1. Update target server's configuration.
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1. Start target server.
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## Stop target server gracefully
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Stop the target server gracefully. For example, if you are using `systemd`,
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run the following command:
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```shell-session
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$ systemctl stop consul
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```
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If your environment uses configuration management automation that might interfere with this process, such as Chef or Puppet, you must disable them until you have completely reverted the storage backend.
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## Remove data directory from target server
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Temporarily moving the data directory to a different location is less destructive than deleting it. We recommend moving the data directory instead of deleted it in cases where you unsuccessfully enable WAL. Do not use the old data directory (`/data-dir/raft.bak`) for recovery after restarting the server. We recommend eventually deleting the old directory.
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The following example assumes the `data_dir` in the server's configuration is `/data-dir` and renames it to `/data-dir.wal.bak`.
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```shell-session
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$ mv /data-dir/raft /data-dir/raft.wal.bak
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```
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When switching backend, you must always remove _the entire raft directory_ not just the `raft.db` file or `wal` directory. This is because the log must always be consistent with the snapshots to avoid undefined behavior or data loss.
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## Update target server's configuration
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Modify the `backend` in the target server's configuration file:
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```hcl
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raft_logstore {
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backend = "boltdb"
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verification {
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enabled = true
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interval = "60s"
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}
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}
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```
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## Start target server
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Start the target server. For example, if you are using `systemd`, run the following command:
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```shell-session
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$ systemctl start consul
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```
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Watch for the server to become a healthy voter again.
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```shell-session
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$ consul operator raft list-peers
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```
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### Clean up old data directories
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If necessary, clean up any `raft.wal.bak` directories. Replace `/data-dir` with the value you specified in your configuration file.
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```shell-session
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$ rm /data-dir/raft.bak
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```
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