(code=exited, status=1/FAILURE) lock file "postmaster.pid" already exists，Failed tostart PostgreSQL

(code=exited, status=1/FAILURE)， lock file "postmaster.pid" already exists，Failed to start PostgreSQL 11 database server. 第一步： 去postgresql的安装目录删除postmaster.pid该文件 第二步： 删除后重启postgresql service postgres

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