为什么docker pull 不能拉最新镜像了

系统cenos7.9

docker pull 拉不到最新版本，需要加版本号，这是怎么回事？
今天买了新服务器，想要装个jenkins
以前照着这个方法Jenkins + Gitee(码云) 实现代码自动化构建都可以成功
今天启动的时候报错

[root@iZwz939moqxs1176gn34ifZ ~]# systemctl start jenkins.service
Job for jenkins.service failed because the control process exited with error code. See "systemctl status jenkins.service" and "journalctl -xe" for details.

[root@iZwz939moqxs1176gn34ifZ ~]# systemctl status jenkins.service
● jenkins.service - Jenkins Continuous Integration Server
   Loaded: loaded (/usr/lib/systemd/system/jenkins.service; disabled; vendor preset: disabled)
   Active: failed (Result: start-limit) since Thu 2022-11-10 22:54:51 CST; 21s ago
  Process: 18385 ExecStart=/usr/bin/jenkins (code=exited, status=1/FAILURE)
 Main PID: 18385 (code=exited, status=1/FAILURE)

Nov 10 22:54:51 iZwz939moqxs1176gn34ifZ systemd[1]: Failed to start Jenkins Continuous Integration Server.
Nov 10 22:54:51 iZwz939moqxs1176gn34ifZ systemd[1]: Unit jenkins.service entered failed state.
Nov 10 22:54:51 iZwz939moqxs1176gn34ifZ systemd[1]: jenkins.service failed.
Nov 10 22:54:51 iZwz939moqxs1176gn34ifZ systemd[1]: jenkins.service holdoff time over, scheduling restart.
Nov 10 22:54:51 iZwz939moqxs1176gn34ifZ systemd[1]: Stopped Jenkins Continuous Integration Server.
Nov 10 22:54:51 iZwz939moqxs1176gn34ifZ systemd[1]: start request repeated too quickly for jenkins.service
Nov 10 22:54:51 iZwz939moqxs1176gn34ifZ systemd[1]: Failed to start Jenkins Continuous Integration Server.
Nov 10 22:54:51 iZwz939moqxs1176gn34ifZ systemd[1]: Unit jenkins.service entered failed state.
Nov 10 22:54:51 iZwz939moqxs1176gn34ifZ systemd[1]: jenkins.service failed.

从入门到放弃