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Configuration

EchoVault is highly configurable. It provides the following configuration options to you:

Flag: --config
Type: string/path
Description: The file path for the server configuration. A JSON or YAML file can be used for server configuration. You can combine CLI flags and config files, but remember that config files override CLI flags. The config file will be prioritised if you have the same config option in the CLI flags and the config file.

Flag: --port
Type: integer
Description: The port on which to listen to client connections. The default is 7480.

Flag: --bind-addr
Type: string
Description: Specify the IP address to which the listener is bound.

Flag: --require-pass
Type: boolean
Description: Determines whether the server should require a password for the default user before allowing commands. The default is false. If this option is provided, it must be accompanied by the --password config.

Flag: --password
Type: string
Description: The password used to authorize the default user to run commands. This flag should be provided alongside the --require-pass flag.

Flag: --tls
Type: boolean
Description: A TLS connection with a client is required. The default is false.

Flag: mtls
Type: boolean
Description: Require mTLS connection with client. It is useful when the client and the server need to verify each other. If --tls and mtls are provided, --mtls will take higher priority. The default is false.

Flag: --cert-key-pair
Type: string
Description: The cert/key pair used by the server to authenticate itself to the client when using TLS or mTLS. This flag can be provided multiple times with multiple cert/key pairs. This is a comma-separated string in the following format: <path-to-cert>,<path-to-key>,

Flag: --client-ca
Type: string
Description: The path to the RootCA that is used to verify client certs when the --mtls flag is provided to enable verifying the client. This flag can be passed multiple times with paths to several client RootCAs.

Flag: --server-id
Type: string
Description: If this node is part of a raft replication cluster, then this flag provides the server ID to use within the cluster configuration. This ID must be unique to all the other nodes' IDs in the cluster.

Flag: --join-addr
Type: string
Description: When adding a node to a replication cluster, this is the address and port of any cluster member. The current node will use this to request permission to join the cluster. The format of this flag is <ip-address>:<discovery-port>.

Flag: --discovery-port
Type: integer
Description. If starting a node in a replication cluster, this port is used for communication between nodes on the memberlist layer. The default is 7946.

Flag: --in-memory
Type: boolean
Description: When starting a node in a raft replication cluster, this directs the raft layer to store logs and snapshots in memory. It is only recommended in test mode. The default is false.

Flag: --data-dir
Type: string
Description: The directory for storing Append-Only Logs, Write Ahead Logs, and Snapshots. The default is /var/lib/echovault

Flag: --bootstrap-cluster
Type: boolean
Description: Whether to initialize a new replication cluster with this node as the leader. The default is false.

Flag: --acl-config
Type: string
Description: The file path for the ACL layer config file. The ACL configuration file can be a YAML or JSON file.

Flag: --snapshot-threshold
Type: integer
Description: The number of write commands required to trigger a snapshot. The default is 1,000

Flag: --snapshot-interval
Type: string
Description: The interval between snapshots. You can provide a parseable time format such as 30m45s or 1h45m. The default is 5 minutes.

Flag: --aof-sync-strategy
Type: string
Description: How often to flush the file contents written to append only file. The options are always for syncing on each command, everysec to sync every second, and no to leave it up to the os.

Flag: --restore-snapshot
Type: boolean
Description: Determines whether to restore from a snapshot on startup. The default is false.

Flag: --restore-aof
Type: boolean
Description: This flag determines whether to restore from an aof file on startup. If both this flag and --restore-snapshot are provided, this flag will take higher priority.

Flag: --forward-commands
Type: boolean
Description: This flag allows you to send write commands to any node in the cluster. The node will forward the command to the cluster leader. When this is false, write commands can only be accepted by the leader. The default is false.

Flag: --max-memory
Type: string
Examples: "200mb", "8gb", "1tb"
Description: The maximum memory usage that EchoVault should observe. Once this limit is reached, the chosen key eviction strategy is triggered. The default is no limit.

Flag: --eviction-policy
Type: string
Description: This flag allows you to choose the key eviction strategy when the maximum memory is reached. The flag accepts the following options:

  1. noeviction - Do not evict any keys even when max-memory is exceeded. All new write operations will be rejected. This is the default eviction strategy.
  2. allkeys-lfu - Evict the least frequently used keys when max-memory is exceeded.
  3. allkeys-lru - Evict the least recently used keys when max-memory is exceeded.
  4. volatile-lfu - Evict the least frequently used keys with an expiration when max-memory is exceeded.
  5. volatile-lru - Evict the least recently used keys with an expiration when max-memory is exceeded.
  6. allkeys-random - Evict random keys until we get under the max-memory limit when max-memory is exceeded.
  7. volatile-random - Evict random keys with an expiration when max-memory is exceeded.

Flag: --eviction-sample
Type: integer
Description: An integer specifying the number of keys to sample when checking for expired keys. By default, EchoVault will sample 20 keys. The sampling is repeated if the number of expired keys found exceeds 20%.

Flag: --eviction-interval
Type: string
Example: "10s", "5m30s", "100ms"
Description: The interval between each sampling of keys to evict. By default, this happens every 100 milliseconds.

Flag: --loadmodule
Type: string/path
Example: "path/to/module.so"
Description: The full file path to the .so file to load into EchoVault to extend its commands. This flag can be specified multiple times to load multiple plugins.