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這篇文章給大家分享的是有關(guān)docker-monitor-injector工具算法的示例分析的內(nèi)容。小編覺(jué)得挺實(shí)用的,因此分享給大家做個(gè)參考,一起跟隨小編過(guò)來(lái)看看吧。
工具介紹 docker-monitor-injector是攜程開(kāi)源的一個(gè)修正docker容器內(nèi)監(jiān)控?cái)?shù)據(jù)的工具,通過(guò)劫持open,fopen等linux庫(kù)函數(shù),重算/proc/meminfo,/proc/stat等度量指標(biāo),使得容器內(nèi)free,top等系統(tǒng)工具能正確統(tǒng)計(jì)容器性能指標(biāo)。下面將對(duì)其進(jìn)行源碼分析,并整理出各個(gè)數(shù)據(jù)的監(jiān)控修正算法。
算法(偽碼)
/proc/uptime
reaperage: time(NULL) - lstat("/proc/1").st_ctime idletime: (reaperage - cpuacct.usage)/1000000000
/proc/meminfo
MemTotal: memory.limit_in_bytes memfree: memlimit - memusage swaptotal: memswlimit > 0 ? memswlimit - memlimit : 0 SwapFree: (memswlimit > 0 && memswusage > 0) ? (memswlimit - memlimit) - (memswusage - memusage):0 cached: memory.stat.total_cache Buffers: 0 SwapCached: 0 Slab: 0
/proc/stat
a.proc_stat_by_shares user_sum: cpuacct.stat.user system_sum: cpuacct.stat.system nice_sum: (_self*cpu.shares/1024)/sysconf(_SC_NPROCESSORS_ONLN) idle_sum: (_self*cpu.shares/1024)/sysconf(_SC_NPROCESSORS_ONLN) iowait_sum: (_self*cpu.shares/1024)/sysconf(_SC_NPROCESSORS_ONLN) irq_sum: (_self*cpu.shares/1024)/sysconf(_SC_NPROCESSORS_ONLN) softirq_sum:(_self*cpu.shares/1024)/sysconf(_SC_NPROCESSORS_ONLN) steal_sum: (_self*cpu.shares/1024)/sysconf(_SC_NPROCESSORS_ONLN) guest_sum: (_self*cpu.shares/1024)/sysconf(_SC_NPROCESSORS_ONLN) 任一cpu stat值算法如下: x = x_sum/sysconf(_SC_NPROCESSORS_ONLN),x_sum為上述任一指標(biāo)
b.flush_proc_stat_by_cpusets
btime: stat("/proc/1").st_ctime user_sum, nice_sum, system_sum, idle_sum, iowait_sum, irq_sum, softirq_sum, steal_sum, guest_sum = 容器所擁有cpu id在/proc/stat中對(duì)應(yīng)值之和。
/proc/cpuinfo
若容器綁定cpu,只輸出綁定cpu id對(duì)應(yīng)cpu info信息 否則,全部輸出
/sys/devices/system/cpu/online
//經(jīng)過(guò)驗(yàn)證,該算法應(yīng)該是有缺陷的,不作分析。
/proc/diskstats
read = blkio.io_serviced:major:minor:Read write = blkio.io_serviced:major:minor:Write read_merged = blkio.io_merged:major:minor:Read write_merged=blkio.io_merged:major:minor:Write read_sectors= blkio.io_service_bytes:major:minor:Read/512 write_sectors= blkio.io_service_bytes:major:minor:Write)/512 rd_svctm = blkio.io_service_time:major:minor:Read/1000000 rd_wait = get_blkio_io_value(blkio.io_wait_time:major:minor:Read)/1000000 read_ticks = rd_svctm + rd_wait wr_svctm = blkio.io_service_time:major:minor:Write/1000000 wr_wait = blkio.io_wait_time:major:minor:Write/1000000; write_ticks = wr_svctm + wr_wait tot_ticks = blkio.io_service_time:major:minor:Total/1000000 ... if (read || write || read_merged || write_merged || read_sectors || write_sectors || read_ticks || write_ticks) { snprintf(lbuf, 256, "%u %u %s %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu %lu\n", major, minor, dev_name, read, read_merged, read_sectors, read_ticks, write, write_merged, write_sectors, write_ticks, ios_pgr, tot_ticks, rq_ticks);
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