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模仿percona的nagios监控插件，实现一个简单的redis服务状态监控插件，判断redis服务器是否存活，是否因为未知原因自动重启过
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| #!/bin/bash | |
| # ######################################################################## | |
| # This program is part of Qunar Monitoring Plugins | |
| # Authors: yinggang.zhao@qunar.com | |
| # ######################################################################## | |
| # ######################################################################## | |
| # Redirect STDERR to STDOUT; Nagios doesn't handle STDERR. | |
| # ######################################################################## | |
| exec 2>&1 | |
| # ######################################################################## | |
| # Set up constants, etc. | |
| # ######################################################################## | |
| STATE_OK=0 | |
| STATE_WARNING=1 | |
| STATE_CRITICAL=2 | |
| STATE_UNKNOWN=3 | |
| STATE_DEPENDENT=4 | |
| redis_client="/usr/bin/redis-cli" | |
| script_name="q-check-redis-server-status" | |
| #下限，1800秒。用户也可以自己定义。默认uptime 为1800秒，就认为server的状态正常 | |
| server_uptime_low_limit=1800 | |
| # ######################################################################## | |
| # Run the program. | |
| # ######################################################################## | |
| main() { | |
| # Get options | |
| for o; do | |
| case "${o}" in | |
| -l) shift; server_uptime_low_limit="${1}"; shift; ;; | |
| -p) shift; OPT_PORT="${1}"; shift; ;; | |
| --help) perl -00 -ne 'm/^ Usage:/ && print' "$0"; exit 0 ;; | |
| -*) echo "Unknown option ${o}. Try --help."; exit 1; ;; | |
| esac | |
| done | |
| if is_not_sourced; then | |
| #如果输入不是以-开头的，就会走到这个分支 | |
| if [ -n "$1" ]; then | |
| echo "WARN spurious command-line options: $@" | |
| exit 1 | |
| fi | |
| fi | |
| #端口为必须的选项 | |
| if [ -z ${OPT_PORT} ]; then | |
| echo "WARN please input your redis port number!" | |
| exit 2 | |
| fi | |
| if [ ! -x "${redis_client}" ]; then | |
| echo "WARN please yum install redis first! ${redis_client} does't exist?" | |
| exit 2 | |
| fi | |
| if [ -z "$1" ]; then | |
| #由于redis的info输出含有换行，此处必须使用tr来过滤 | |
| server_uptime=$(${redis_client} -h 127.0.0.1 -p ${OPT_PORT} info|grep -i -E "uptime_in_seconds"|tr -d "\n\r"|awk -F ":" '{print $2}') | |
| fi | |
| if [ ! -z ${server_uptime} ]; then | |
| if [ ${server_uptime} -gt ${server_uptime_low_limit} ]; then | |
| NOTE="OK redis server uptime is ${server_uptime}. uptime low limit is ${server_uptime_low_limit}. so status OK" | |
| else | |
| NOTE="CRIT redis server uptime is ${server_uptime}, less than ${server_uptime_low_limit}. please check" | |
| fi | |
| #如果redis连接不上 | |
| else | |
| NOTE="CRIT fatal! redis server down!" | |
| fi | |
| echo $NOTE | |
| } | |
| # ######################################################################## | |
| # Determine whether this program is being executed directly, or sourced/included | |
| # from another file. | |
| # ######################################################################## | |
| is_not_sourced() { | |
| [ "${0##*/}" = "${script_name}" ] || [ "${0##*/}" = "bash" -a "$_" = "$0" ] | |
| } | |
| # ######################################################################## | |
| # Execute the program if it was not included from another file. | |
| # This makes it possible to include without executing, and thus test. | |
| # ######################################################################## | |
| #下面的语句，跟python的if __name__ == "__main__" 一样，可以便于调试，非常cool | |
| if is_not_sourced; then | |
| OUTPUT=$(main "$@") | |
| EXITSTATUS=$STATE_UNKNOWN | |
| case "${OUTPUT}" in | |
| UNK*) EXITSTATUS=$STATE_UNKNOWN; ;; | |
| OK*) EXITSTATUS=$STATE_OK; ;; | |
| WARN*) EXITSTATUS=$STATE_WARNING; ;; | |
| CRIT*) EXITSTATUS=$STATE_CRITICAL; ;; | |
| esac | |
| echo "${OUTPUT}" | |
| exit $EXITSTATUS | |
| fi | |
| # ############################################################################ | |
| # Documentation | |
| # ############################################################################ | |
| : <<'DOCUMENTATION' | |
| Usage: ./script_name [OPTIONS] | |
| Options: | |
| -l uptime low limit | |
| -p redis port. 6379... | |
| --help show this help message | |
| Options must be given as --option value, not --option=value or -Ovalue. | |
| readme here... | |
| DOCUMENTATION |
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