rhel7.9 搭建docker registry 的时候，需要密码登录，x509 证书认证，在htpasswd 生成密码的时候报错：
$ docker run –entrypoint htpasswd registry:latest -Bbn test 123456 >> /opt/docker/registry/auth/htpasswd
docker: Error response from daemon: OCI runtime create failed: container_linux.go:380: starting container process caused: exec: “htpasswd”: executable file not found in $PATH: unknown.
ERRO[0000] error waiting for container: context canceled
多次试验之后，终于解决了，解决方法如下：
$ yum -y install httpd
$ htpasswd -Bbn test 123456 > auth/htpasswd
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