我正在尝试使JBoss WildFly 15.0.1 Final在相当小的ubuntu 14.04 vServer上启动。服务器仅具有2 GB的RAM。
我尝试多次启动WildFly均未成功。 JVM似乎需要比我期望的要多得多的RAM。
这是控制台输出：
root@t2g55:~# service wildfly start
* Starting WildFly Application Server wildfly
* WildFly Application Server failed to start within the timeout allowed.
root@t2g55:~# cat /var/log/wildfly/console.log
=========================================================================
JBoss Bootstrap Environment
JBOSS_HOME: /opt/wildfly
JAVA: /usr/bin/java
JAVA_OPTS: -server -Xms768m -Xmx1536m -XX:MetaspaceSize=96M -XX:MaxMetaspaceSize=256m -Djava.net.preferIPv4Stack=true -Djboss.modules.system.pkgs=org.jboss.byteman -Djava.awt.headless=true
=========================================================================
OpenJDK 64-Bit Server VM warning: INFO: os::commit_memory(0x00000000a0000000, 536870912, 0) failed; error='Cannot allocate memory' (errno=12)
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 536870912 bytes for committing reserved memory.
# An error report file with more information is saved as:
# /opt/wildfly-15.0.1.Final/hs_err_pid1379.log
1379
root@t2g55:~# free
total used free shared buffers cached
Mem: 2097152 258748 1838404 64 0 38644
-/+ buffers/cache: 220104 1877048
Swap: 2097152 0 2097152
root@t2g55:~# java -version
openjdk version "1.8.0_222"
OpenJDK Runtime Environment (build 1.8.0_222-8u222-b10-1~14.04-b10)
OpenJDK 64-Bit Server VM (build 25.222-b10, mixed mode)
root@t2g55:~#
您可以看到我指定了JAVA_OPTS: -server -Xms768m -Xmx1536m ...，我认为这足以启动WildFly服务器。请不要，standalone.xml已为MySQL DB定义了数据源。
这里是转储.log的开始：
root@t2g55:~# cat /opt/wildfly-15.0.1.Final/hs_err_pid1379.log
#
# There is insufficient memory for the Java Runtime Environment to continue.
# Native memory allocation (mmap) failed to map 536870912 bytes for committing reserved memory.
# Possible reasons:
# The system is out of physical RAM or swap space
# The process is running with CompressedOops enabled, and the Java Heap may be blocking the growth of the native heap
# Possible solutions:
# Reduce memory load on the system
# Increase physical memory or swap space
# Check if swap backing store is full
# 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:2757), pid=1379, tid=0x00007f62486c6700
#
# JRE version: (8.0_222-b10) (build )
# Java VM: OpenJDK 64-Bit Server VM (25.222-b10 mixed mode linux-amd64 compressed oops)
# Failed to write core dump. Core dumps have been disabled. To enable core dumping, try "ulimit -c unlimited" before starting Java again
#
--------------- T H R E A D ---------------
.
.
.
问题：
可以用这么多的内存来解决吗，还是我的RAM太少了？我还能尝试什么？
我真的不希望我的提供者先后跟上记忆，只是发现Java，JVM或其他任何问题...
谢谢
编辑1：
vServer提供程序使用OpenVZ进行虚拟化。
信息：他们只是将我推送到4GB，然后有一次，我启动并运行了JBoss。重新启动后，WildFly再次拒绝启动：同一件事，没有足够的内存（即使我在Java 8和Java 11运行时之间切换）。
CMD启动JBoss WildFly：sh /opt/wildfly/bin/standalone.sh &，standalone.xml似乎正常。我删除了ExampleDS，对三个条目进行了评论。
确实是OpenVZ的服务器虚拟化问题。
语录（德语）：
嗨，在user_beancounters上出现问题，在privvmpages上出现问题，> zu gering eingestellt。https://wiki.openvz.org/UBC_secondary_parameters#privvmpages
Mit freundlichenGrüßen
X先生
翻译：
嗨，问题出在user_beancounters，也就是privvmpages，这些设置太低了。https://wiki.openvz.org/UBC_secondary_parameters#privvmpages
最诚挚的问候
X先生
我不知道他到底做了什么，但是解决了。
我现在在2GB的计算机上运行，没有任何问题，mysqld + standalone.sh（WildFly + webapp）的内存使用约为800 MB。