溫馨提示×
您好，登錄后才能下訂單哦！
點擊 登錄注冊 即表示同意《億速云用戶服務(wù)條款》
您好，登錄后才能下訂單哦！
一、Docker啟動異常表現(xiàn)：
1.狀態(tài)反復restaring，用命令查看
$docker ps -a CONTAINER ID IMAGE COMMAND CREATED STATUS PORTS NAMES 21c09be88c11 docker.xxxx.cn:5000/xxx-tes/xxx_tes:1.0.6 "/usr/local/tomcat..." 9 days ago Restarting (1) Less than a second ago xxx10
2.Docker日志有明顯問題：
$docker logs [容器名/容器ID]
二、Docker啟動異常的可能原因：
2.1.內(nèi)存不夠
Docker 啟動至少需要2G內(nèi)存，首先執(zhí)行free -mh命令查看剩余內(nèi)存是否足夠
直接查看內(nèi)存
$free -mh
total used free shared buff/cache available
Mem: 15G 14G 627M 195M 636M 726M
Swap: 0B 0B 0B
分析日志
有時候一瞬間內(nèi)存過載溢出，導致部分進程被殺死，看起來內(nèi)存也是夠用的，事實上docker還是會反復重啟，就需要通過docker日志和系統(tǒng)日志信的息來進一步分析：
分析docker日志
查看docker日志看到內(nèi)存溢出的信息，要仔細翻閱才能找到信息，并不是在最下面
$docker logs [容器名/容器ID]|less Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000769990000, 1449590784, 0) failed; error='Cannot allocate memory' (errno=12) # # There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (malloc) failed to allocate 1449590784 bytes for committing reserved memory. # An error report file with more information is saved as: # //hs_err_pid1.log Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000769990000, 1449590784, 0) failed; error='Cannot allocate memory' (errno=12) # # There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (malloc) failed to allocate 1449590784 bytes for committing reserved memory. # An error report file with more information is saved as: # /tmp/hs_err_pid1.log Java HotSpot(TM) 64-Bit Server VM warning: INFO: os::commit_memory(0x0000000769990000, 1449590784, 0) failed; error='Cannot allocate memory' (errno=12) # # There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (malloc) failed to allocate 1449590784 bytes for committing reserved memory. # Can not save log file, dump to screen.. # # There is insufficient memory for the Java Runtime Environment to continue. # Native memory allocation (malloc) failed to allocate 1449590784 bytes for committing reserved memory. # Possible reasons: # The system is out of physical RAM or swap space # In 32 bit mode, the process size limit was hit # Possible solutions: # Reduce memory load on the system # Increase physical memory or swap space # Check if swap backing store is full # Use 64 bit Java on a 64 bit OS # Decrease Java heap size (-Xmx/-Xms) # Decrease number of Java threads # Decrease Java thread stack sizes (-Xss) # Set larger code cache with -XX:ReservedCodeCacheSize= # This output file may be truncated or incomplete. # # Out of Memory Error (os_linux.cpp:2756), pid=1, tid=140325689620224 # # JRE version: (7.0_79-b15) (build ) # Java VM: Java HotSpot(TM) 64-Bit Server VM (24.79-b02 mixed mode linux-amd64 compressed oops) # Core dump written. Default location: //core or core.1 #
分析系統(tǒng)日志
查看系統(tǒng)日志，發(fā)現(xiàn)有大量由于內(nèi)存溢出，進程被殺死的記錄
$grep -i 'Out of Memory' /var/log/messages Apr 7 10:04:02 centos106 kernel: Out of memory: Kill process 1192 (java) score 54 or sacrifice child Apr 7 10:08:00 centos106 kernel: Out of memory: Kill process 2301 (java) score 54 or sacrifice child Apr 7 10:09:59 centos106 kernel: Out of memory: Kill process 28145 (java) score 52 or sacrifice child Apr 7 10:20:40 centos106 kernel: Out of memory: Kill process 2976 (java) score 54 or sacrifice child Apr 7 10:21:08 centos106 kernel: Out of memory: Kill process 3577 (java) score 47 or sacrifice child Apr 7 10:21:08 centos106 kernel: Out of memory: Kill process 3631 (java) score 47 or sacrifice child Apr 7 10:21:08 centos106 kernel: Out of memory: Kill process 3634 (java) score 47 or sacrifice child Apr 7 10:21:08 centos106 kernel: Out of memory: Kill process 3640 (java) score 47 or sacrifice child Apr 7 10:21:08 centos106 kernel: Out of memory: Kill process 3654 (java) score 47 or sacrifice child Apr 7 10:27:27 centos106 kernel: Out of memory: Kill process 6998 (java) score 51 or sacrifice child Apr 7 10:27:28 centos106 kernel: Out of memory: Kill process 7027 (java) score 52 or sacrifice child Apr 7 10:28:10 centos106 kernel: Out of memory: Kill process 7571 (java) score 42 or sacrifice child Apr 7 10:28:10 centos106 kernel: Out of memory: Kill process 7586 (java) score 42 or sacrifice child
2.2.端口沖突
該docker監(jiān)聽端口已經(jīng)被其他進程占用，一般此種問題容易出現(xiàn)在新部署的服務(wù)，或在原有機器上部署新的后臺服務(wù)，所以在部署之前應(yīng)該執(zhí)行命令檢查端口是否已經(jīng)被占用，如果上線后發(fā)現(xiàn)占有則應(yīng)改為可用端口再重啟之。
檢查命令： $netstat -nltp|grep [規(guī)劃的端口號]
三、對策
3.1.內(nèi)存不夠的對策：
對策1:
3.1.1 saltstack的minion在運行過久之后，可能占用大量內(nèi)存，需要將其重啟。重啟命令可能有時并不起作用。主要檢查運行狀態(tài)，如果未成功停止，則重新重啟；
對策2:
3.2.2 ELK日志收集程序或者其他java進程占用過高，用top和ps命令排查，謹慎確定進程的作用，在確保不影響業(yè)務(wù)的情況下，停止相關(guān)進程；
對策3:
釋放被占用的內(nèi)存（buff/cache）：
$sync #將內(nèi)存數(shù)據(jù)寫入磁盤
$echo 3 > /proc/sys/vm/drop_caches #釋放被占用的內(nèi)存
對策4:
有時候并不是buff/cache過高導致內(nèi)存不夠用，確實是被很多必要的進程消耗掉了內(nèi)存，那就需要從機器資源分配使用的層面去考慮和解決了。
3.2 端口沖突的對策
對策1:
一般此種問題容易出現(xiàn)在新部署的服務(wù)，或在原有機器上部署新的后臺服務(wù)，所以在部署之前應(yīng)該執(zhí)行命令檢查端口是否已經(jīng)被占用，如果上線后發(fā)現(xiàn)占有則應(yīng)改為可用端口再重啟之。
檢查命令： $netstat -nltp|grep [規(guī)劃的端口號]
以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持億速云。
免責聲明：本站發(fā)布的內(nèi)容（圖片、視頻和文字）以原創(chuàng)、轉(zhuǎn)載和分享為主，文章觀點不代表本網(wǎng)站立場，如果涉及侵權(quán)請聯(lián)系站長郵箱：is@yisu.com進行舉報，并提供相關(guān)證據(jù)，一經(jīng)查實，將立刻刪除涉嫌侵權(quán)內(nèi)容。
億速云公眾號
手機網(wǎng)站二維碼