问题描述：
在执行docker cp命令的时候，从宿主机复制文件到容器操作执行正常，但是从容器复制文件到宿主机的时候报如下所示报错：
Error response from daemon: error processing tar file: docker-tar: relocation error: /lib/x86_64-linux-gnu/libnss_files.so.2: symbol __libc_readline_unlocked, version GLIBC_PRIVATE not defined in file libc.so.6 with link time reference
: exit status 127
问题原因：
docker版本导致
Initialize nss libraries in Glibc so that the dynamic libraries are loaded in the host environment not in the chroot from untrusted files. CVE-2019-14271 may allow unprivileged access to host system while copying files from a malicious container image with docker cp command. Affected versions: v19.03.0. Older Docker versions are not affected by this issue. This fix is included in the already released Docker v19.03.1. Users of Docker v19.03.0 are advised to upgrade.
解决办法：
升级docker版本
[root@VM_0_16_centos ~]# yum remove -y docker-ce docker-ce-cli
[root@VM_0_16_centos ~]# yum -y install docker-ce docker-ce-cli
