监控(TBD)

Each etcd server exports metrics under the /metrics path on its client port.
The metrics can be fetched with curl:
$ curl -L http://localhost:2379/metrics
# HELP etcd_debugging_mvcc_keys_total Total number of keys.
# TYPE etcd_debugging_mvcc_keys_total gauge
etcd_debugging_mvcc_keys_total 0
# HELP etcd_debugging_mvcc_pending_events_total Total number of pending events to be sent.
# TYPE etcd_debugging_mvcc_pending_events_total gauge
etcd_debugging_mvcc_pending_events_total 0
...

Prometheus

Running a Prometheus monitoring service is the easiest way to ingest and record etcd's metrics.
First, install Prometheus:
PROMETHEUS_VERSION="1.3.1"
wget https://github.com/prometheus/prometheus/releases/download/v$PROMETHEUS_VERSION/prometheus-$PROMETHEUS_VERSION.linux-amd64.tar.gz -O /tmp/prometheus-$PROMETHEUS_VERSION.linux-amd64.tar.gz
tar -xvzf /tmp/prometheus-$PROMETHEUS_VERSION.linux-amd64.tar.gz --directory /tmp/ --strip-components=1
/tmp/prometheus -version
Set Prometheus's scraper to target the etcd cluster endpoints:
cat > /tmp/test-etcd.yaml <<EOF
global:
scrape_interval: 10s
scrape_configs:
- job_name: test-etcd
static_configs:
- targets: ['10.240.0.32:2379','10.240.0.33:2379','10.240.0.34:2379']
EOF
cat /tmp/test-etcd.yaml
Set up the Prometheus handler:
nohup /tmp/prometheus \
-config.file /tmp/test-etcd.yaml \
-web.listen-address ":9090" \
-storage.local.path "test-etcd.data" >> /tmp/test-etcd.log 2>&1 &
Now Prometheus will scrape etcd metrics every 10 seconds.

Grafana

Grafana has built-in Prometheus support; just add a Prometheus data source:
Name: test-etcd
Type: Prometheus
Url: http://localhost:9090
Access: proxy
Then import the default etcd dashboard template and customize. For instance, if Prometheus data source name is my-etcd, the datasource field values in JSON also need to be my-etcd.
See the demo.
Sample dashboard: