yum安装opennms
1.官网列表中寻找需要的资源：http://yum.opennms.org/repofiles/
2.运行命令：rpm -Uvh http://yum.opennms.org/repofiles/opennms-repo-bleeding-rhel6.noarch.rpm
命令后面的http网址，就是选中要下载的资源文件URL
3.查看是否安装成功： yum list opennms
[root@VM-local ~]# yum list opennms
已加载插件：fastestmirror, refresh-packagekit, security
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* epel: mirrors.tuna.tsinghua.edu.cn
* extras: mirrors.tuna.tsinghua.edu.cn
* updates: mirrors.163.com
可安装的软件包
opennms.noarch 26.0.0-0.20191021.opennms.develop.145 opennms-repo-bleeding-common
4.安装：yum install opennms
报错：
错误：Package: opennms-26.0.0-0.20191021.opennms.develop.145.noarch (opennms-repo-bleeding-common)
Requires: postgresql-server >= 9.1
已安装: postgresql-server-8.4.20-8.el6_9.x86_64 (@base)
postgresql-server = 8.4.20-8.el6_9
错误：Package: opennms-26.0.0-0.20191021.opennms.develop.145.noarch (opennms-repo-bleeding-common)
Requires: java-11-openjdk-devel
You could try using --skip-broken to work around the problem
** Found 2 pre-existing rpmdb problem(s), 'yum check' output follows:
2:postfix-2.6.6-8.el6.x86_64 has missing requires of libmysqlclient.so.16()(64bit)
2:postfix-2.6.6-8.el6.x86_64 has missing requires of libmysqlclient.so.16(libmysqlclient_16)(64bit)
说我的配套软件版本太低，重新安装配套文件：
......查了下资料以后，发现找不到java-11-openjdk-devel
https://pkgs.org/download/java-11 在下载网站中找不到centos6的java-11下载链接
还需要换系统才行，放弃。
关键性依赖缺失，我不认识它啊，卸载：rpm -e --nodeps postfix-2.6.6-8.el6.x86_64
干掉一个，同样的位置又出现其他的问题：
** Found 2 pre-existing rpmdb problem(s), 'yum check' output follows:
cronie-1.4.4-15.el6_7.1.x86_64 has missing requires of /usr/sbin/sendmail
redhat-lsb-core-4.0-7.el6.centos.x86_64 has missing requires of /usr/sbin/sendmail
这什么玩意，放弃。
自此，在centos6下opennms安装失败。
5.在centos7下安装
在centos7系统下，重复上面四步，安装成功了。
碰到包下载速度慢的问题，我是找到yum保存rpm文件的位置，再去网页上下载源文件，直接上传的，opennms的core包太大，虚拟机下载实在太慢还老是断开连接
6.postgresql配置
初始化：postgresql-setup initdb
启动：service postgresql start
修改配置，vi /var/lib/pgsql/data/pg_hba.conf，内容如下：
# TYPE DATABASE USER ADDRESS METHOD
# "local" is for Unix domain socket connections only
local all all trust
# IPv4 local connections:
host all all 127.0.0.1/32 trust
# IPv6 local connections:
host all all ::1/128 trust
7.告诉OpenNMS JDK在那里
运行命令：$OPENNMS_HOME/bin/runjava -S /usr/lib/jvm/java-11-openjdk-11.0.4.11-1.el7_7.x86_64/bin/java
这里的java，是安装opennms时同时安装的Java11
8.初始化OpenNMS的数据库
运行命令：$OPENNMS_HOME/bin/install -disU -l /usr/lib/jni:/usr/lib
报错：
Caused by: org.opennms.core.schema.MigrationException: Unsupported database version "9.200000" -- you need at least 10.000000 and less than 13.000000. Use the "-Q" option to disable this check if you feel brave and are willing to find and fix bugs found yourself.
at org.opennms.core.schema.Migrator.validateDatabaseVersion(Migrator.java:200)
at org.opennms.install.Installer.install(Installer.java:246)
at org.opennms.install.Installer.main(Installer.java:995)
这鬼软件自动安装postgreSQL居然自己不适配自己，垃圾
安装他的提示，执行命令：$OPENNMS_HOME/bin/install -disU -Q -l /usr/lib/jni:/usr/lib
报错：
Caused by: org.postgresql.util.PSQLException: ERROR: type "jsonb" does not exist
jsonb是postgreSQL的数据结构，和int、varchar是一样的，在9.4之后的版本中才支持
重装postgreSQL，见 https://blog.csdn.net/qq_31156277/article/details/84291004
感谢这位兄弟
使用下面的命令重新配置一遍postgreSQL
/usr/pgsql-10/bin/postgresql-10-setup initdb
vi /var/lib/pgsql/10/data/pg_hba.conf
service postgresql-10 restart
再执行 $OPENNMS_HOME/bin/install -disU -l /usr/lib/jni:/usr/lib
终于看到，completed successfully!
9.启动OpenNMS
运行命令：systemctl start opennms.service
可以通过ps -ef|grep opennms看到进程
10.访问OpenNMS
http://ip:8980/opennms
用户名和密码都是admin
没有访问到界面......查了下关联的容器是jetty，它的默认访问端口是8980，但是并没有找到jetty的进程