[linux]systemctl start 에러 시행착오

목차

ex)
systemctl start postgresql-9.6.service
Job for postgresql-9.6.service failed because the control process exited with error code. See "systemctl status postgresql-9.6.service" and "journalctl -xe" for details.

systemctl에 등록된 서비스 실행 시 위와 같은 에러를 발견하는 운 나쁜 경우가 생기면
systemctl status postgresql-9.6.service(등록된 서비스명)과 journalctl -xe를 통해서 로그를 확인해서 문제를 해결해야 함

회사에서 postgreSQL가 root로 systemctl start로 실행 시(원래 잘 되다가 오라클 설치하면서 리눅스 설정을 좀 변경한게 원인 인 듯)
나의 경우 postgresql-9.6.service를 실행 한 경우 아래처럼 에러가 발생 했었음

[root@centos7 ~]# systemctl status postgresql-9.6.service
● postgresql-9.6.service - PostgreSQL 9.6 database server
   Loaded: loaded (/usr/lib/systemd/system/postgresql-9.6.service; enabled; vendor preset: disabled)
   Active: failed (Result: exit-code) since 화 2021-10-19 15:30:09 KST; 50s ago
     Docs: https://www.postgresql.org/docs/9.6/static/
  Process: 30514 ExecStart=/usr/pgsql-9.6/bin/postmaster -D ${PGDATA} (code=exited, status=1/FAILURE)
  Process: 30507 ExecStartPre=/usr/pgsql-9.6/bin/postgresql96-check-db-dir ${PGDATA} (code=exited, status=0/SUCCESS)
 Main PID: 30514 (code=exited, status=1/FAILURE)

10월 19 15:30:08 centos7 systemd[1]: Starting PostgreSQL 9.6 database server...
10월 19 15:30:09 centos7 postmaster[30514]: < 2021-10-19 15:30:09.071 KST > 로그:  redirecting log output to logging… process
10월 19 15:30:09 centos7 postmaster[30514]: < 2021-10-19 15:30:09.071 KST > 힌트:  Future log output will appear in …pg_log".
10월 19 15:30:09 centos7 systemd[1]: postgresql-9.6.service: main process exited, code=exited, status=1/FAILURE
10월 19 15:30:09 centos7 systemd[1]: Failed to start PostgreSQL 9.6 database server.
10월 19 15:30:09 centos7 systemd[1]: Unit postgresql-9.6.service entered failed state.
10월 19 15:30:09 centos7 systemd[1]: postgresql-9.6.service failed.
Hint: Some lines were ellipsized, use -l to show in full.

구글링 해 본 결과.. 정보가 많이 부족 했었지만 어떤 블로그를 참조해서 아래처럼 에러가 발생하는 경로에 직접 들어가서 서비스를 실행 해 봤음

/usr/pgsql-9.6/bin/postmaster

그 결과 권한 문제라고 아래처럼 나왔음

시스템 보안 관련 문제로, PostgreSQL server를 "root" ID로 실행할 수 없습니다.
반드시 일반 사용자 ID(시스템 관리자 권한이 없는 ID)로 서버를 실행하십시오.
Server를 어떻게 안전하게 기동하는가 하는 것은 문서를 참조하시기 바랍니다.

그래서 sudo 권한 있는 일반 사용자 계정으로 systemctl start 서비스명을 입력 했는데 되네...
systemctl은 원래 root로만 실행이 가능, sudo 권한 있는 계정으로 실행 시 root 비밀번호를 입력하라고 나오는데 root 비밀번호 입력 후 정상 실행이 됨

systemctl 에러를 안 만나길 바라지만 만일 에러를 만날 경우 경로에 직접 들어가서 실행해 본 다음 에러로그를 보면서 문제 해결이 필요하다고 생각됨