Oracle 12.2监听无法启动解决方法

在自己的虚拟机的做实验，突然发现使用PL/sql Developer无法连接到数据库，报错ORA-12514，说是监听没有启动。

先介绍虚拟机一下环境：redhat7.2+GI 12.2.0.1+oracle 12.2.0.1，为了测试12.2的ASM特性安装了GI。平时监听程序默认是开启启动的。但是今天不知道为什么没有启动。使用crsctl查看资源状态：发现监听的状态确实是OFFLINE状态

[root@rhel7 .oracle]# crsstat
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Name      Target State    Server          State details    
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Local Resources
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ora.DATA.dg
        ONLINE ONLINE    rhel7          STABLE
ora.LISTENER.lsnr
        ONLINE OFFLINE   rhel7          STABLE
ora.asm
        ONLINE ONLINE    rhel7          Started,STABLE
ora.ons
        OFFLINE OFFLINE   rhel7          STABLE
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Cluster Resources
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ora.CSSd
   1    ONLINE ONLINE    rhel7          STABLE
ora.diskmon
   1    OFFLINE OFFLINE                STABLE
ora.driver.afd
   1    ONLINE ONLINE    rhel7          STABLE
ora.evmd
   1    ONLINE ONLINE    rhel7          STABLE
ora.ora12c.db
   1    ONLINE ONLINE    rhel7          Open,HOME=/u01/app/o
                               racle/product/12.2/d
                               b_home1,STABLE
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