解决方案：

1.7.1版本：

vi /etc/sysconfig/docker

在DOCKER_CERT_PATH=/etc/docker上方添加：other_args='--insecure-registry 192.168.1.215:5000 --selinux-enabled'

代码如下：

# /etc/sysconfig/docker
#
# Other arguments to pass to the docker daemon process
# These will be parsed by the sysv initscript and appended
# to the arguments list passed to docker -d

other_args='--insecure-registry 192.168.1.215:5000 --selinux-enabled'
DOCKER_CERT_PATH=/etc/docker

# Resolves: rhbz#1176302 (docker issue #407)
DOCKER_NOWARN_KERNEL_VERSION=1

# Location used for temporary files, such as those created by
# # docker load and build operations. Default is /var/lib/docker/tmp
# # Can be overriden by setting the following environment variable.
# # DOCKER_TMPDIR=/var/tmp

重启docker，pull成功