详解Docker无法正常启动的原因及解决办法

2019-10-24 20:56 来源:易采站长站 作者:于丽 点击: 评论:

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原标题:详解Docker无法正常启动的原因及解决办法

一、Docker启动异常表现:

1.状态反复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日志有明显问题:

$docker logs [容器名/容器ID]

二、Docker启动异常的可能原因:

2.1.内存不够

Docker 启动至少需要2G内存,首先执行free -mh命令查看剩余内存是否足够

直接查看内存

$free -mh
      total    used    free   shared buff/cache  available
Mem:     15G     14G     627M    195M    636M   726M
Swap:     0B     0B     0B

分析日志

有时候一瞬间内存过载溢出,导致部分进程被杀死,看起来内存也是够用的,事实上docker还是会反复重启,就需要通过docker日志和系统日志信的息来进一步分析:

分析docker日志

查看docker日志看到内存溢出的信息,要仔细翻阅才能找到信息,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
#

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