LogDevice 安裝完後，可以啟動 Local cluster 試試。
調用 ld-dev-cluster 命令即可啟動 Local cluster。
./_build/bin/ld-dev-cluster
Local cluster 會建立暫存的目錄、啟動五個節點。
啟動時會顯示如下畫面，提示我們可以使用的命令，及怎樣操作。
...
Cluster running. ^C or type "quit" or "q" to stop. Commands:
replace <nid> Replace a node (kill the old node, wipe the existing data, start a replacement). Do not wait for rebuilding.
start <nid> Start a node if it is not already started.
stop <nid> Pause logdeviced by sending SIGSTOP. Waits for the process to stop accepting connections.
resume <nid> Resume logdeviced by sending SIGCONT. Waits for the process to start accepting connections again.
kill <nid> Kill a node.
expand <n> Add new nodes to the cluster.
shrink <n> Remove nodes from the cluster.
To create a log range:
ldshell -c /tmp/logdevice/IntegrationTestUtils.8b62-42b5-1e7a-7cec/logdevice.conf logs create --from 1 --to 100 --replicate-across "node: 2" test_logs
To write to log 1:
echo hello | _build/bin/ldwrite /tmp/logdevice/IntegrationTestUtils.8b62-42b5-1e7a-7cec/logdevice.conf 1
To start a tailer for log 1:
_build/bin/ldtail /tmp/logdevice/IntegrationTestUtils.8b62-42b5-1e7a-7cec/logdevice.conf 1 --follow
To tail the error log of a node:
tail -f /tmp/logdevice/IntegrationTestUtils.8b62-42b5-1e7a-7cec/N0:1/log
To send an admin command to a node:
echo info | nc -U /tmp/logdevice/IntegrationTestUtils.8b62-42b5-1e7a-7cec/N0:1/socket_command
NOTE: Internal LogsConfig Manager is ENABLED.
You will need to use ldshell to create logs and provision before use
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