日志记录 API 示例
日志记录 API 示例
以下是日志记录 API 的一些常见使用示例。
前提条件:
- Bash
- Curl
- jq
- DC/OS
- 必须安装、配置和登录 DC/OS CLI。
-
从 DC/OS CLI 提取
DCOS_URL
和DCOS_AUTH_TOKEN
:DCOS_URL="$(dcos config show core.dcos_url)"
DCOS_URL="${DCOS_URL%/}" # strip trailing slash, if present
DCOS_AUTH_TOKEN="$(dcos config show core.dcos_acs_token)"
节点日志
从单个节点获取最后 100 个日志条目:
curl -k -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/logs/v1/range/?skip_prev=100"
组件日志
从单个组件服务获取最后 100 个日志条目:
领导 Mesos 管理节点:
curl -k -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/leader/mesos/logs/v1/range/?skip_prev=100&filter=_SYSTEMD_UNIT:dcos-mesos-master.service"
领导 Marathon:
curl -k -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/leader/marathon/logs/v1/range/?skip_prev=100&filter=_SYSTEMD_UNIT:dcos-mesos-master.service"
代理 DNS 转发器 (Spartan):
# select an agent ID
AGENT_ID="$(dcos node --json | jq -r '.[0].id)')"
curl -k -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/agent/${AGENT_ID}/logs/v1/range/?skip_prev=1&filter=_SYSTEMD_UNIT:dcos-spartan.service"
容器日志
重要信息:以下示例需要进行 journald 任务日志记录,它默认为 禁用。
从单个组件容器获取最后 100 个日志条目:
FRAMEWORK_NAME="marathon"
APP_ID="nginx"
# get the mesos task state json
MESOS_STATE="$(curl -k -H "Authorization: token=${DCOS_AUTH_TOKEN}" ${DCOS_URL}/mesos/state)"
TASK_STATE="$(echo "${MESOS_STATE}" | jq ".frameworks[] | select(.name == \"${FRAMEWORK_NAME}\") | .tasks[] | select(.name == \"${APP_ID}\")")"
# extract values from the task json
AGENT_ID="$(echo "${TASK_STATE}" | jq -r '.slave_id')"
TASK_ID="$(echo "${TASK_STATE}" | jq -r '.id')"
FRAMEWORK_ID="$(echo "${TASK_STATE}" | jq -r '.framework_id')"
EXECUTOR_ID="$(echo "${TASK_STATE}" | jq -r '.executor_id')"
CONTAINER_ID="$(echo "${TASK_STATE}" | jq -r '.statuses[0].container_status.container_id.value')"
# default to container ID when executor ID is empty
EXECUTOR_ID="${EXECUTOR_ID:-${TASK_ID}}"
# get container/task logs
curl -k -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/agent/${AGENT_ID}/logs/v1/range/framework/${FRAMEWORK_ID}/executor/${EXECUTOR_ID}/container/${CONTAINER_ID}?skip_prev=100"
结尾
获取最后 10 个日记账条目并追踪新事件:
curl -k -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/logs/v1/stream/?skip_prev=10"
范围
从日志开头跳过 100 个条目,并返回接下来的 10 个条目:
curl -k -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/logs/v1/range/?skip_next=100&limit=10"
纯文本
从日志开头跳过 200 个条目,并以纯文本返回下一个条目:
curl -k -H "Accept: text/plain" -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/logs/v1/range/?skip_next=200&limit=1"
JSON
从日志开头跳过 200 个条目,并以 JSON 返回下一个条目:
curl -k -H "Accept: application/json" -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/logs/v1/range/?skip_next=200&limit=1"
事件流
从日志开头跳过 200 个条目,并返回作为事件流的下一个条目:
curl -k -H "Accept: text/event-stream" -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/logs/v1/range/?skip_next=200&limit=1"
事件流游标
获取特定游标后的所有日志条目并流式传输新条目:
# Get the 10th line in json and parse its cursor
CURSOR="$(curl -k -H "Accept: application/json" -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/logs/v1/range/?skip_next=9&limit=1" | jq -r ".cursor")"
# Follow the stream in plain text starting at the 11th line using the cursor
curl -k -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/logs/v1/stream/" --get --data-urlencode "cursor=${CURSOR}"
游标必须为 URL 编码。
范围游标
获取 1,000 个日志条目,每次 100 个:
TIMES=10 # number of times to call the endpoint
LINES=100 # number of log lines to retrieve per call
CURSOR="" # first call uses an empty cursor to start from the beginning
for i in $(seq 1 ${TIMES}); do
BUFFER="$(curl -k -H "Accept: application/json" -H "Authorization: token=${DCOS_AUTH_TOKEN}" "${DCOS_URL}/system/v1/logs/v1/range/?limit=${LINES}" --get --data-urlencode "cursor=${CURSOR}")"
echo "${BUFFER}"
CURSOR="$(echo "${BUFFER}" | jq -r ".cursor" | tail -1)"
done
每次调用都使用上次调用中最后一个条目的光标。游标必须为 URL 编码。