https://maciej.lasyk.info/2016/Dec/16/systemd-231-latest-in-centos-7-thx-to-facebook/
https://copr.fedorainfracloud.org/coprs/jsynacek/systemd-backports-for-centos-7/
Centos7 当前版本使用 systemd version 219 ，发布于 2015-02-16 (see NEWS)。
这么个大问题，导致很多相关功能的重要特性我们用不到，比如journald, networkd, machinectl, systemd-nspawn 等。
升级方法
wget https://copr.fedorainfracloud.org/coprs/jsynacek/systemd-backports-for-centos-7/repo/epel-7/jsynacek-systemd-backports-for-centos-7-epel-7.repo \
-O /etc/yum.repos.d/jsynacek-systemd-centos-7.repo
yum update systemd
升级完毕后，如下
[root@localhost ~]# systemctl --version
systemd 234
+PAM +AUDIT +SELINUX +IMA -APPARMOR +SMACK +SYSVINIT +UTMP +LIBCRYPTSETUP +GCRYPT +GNUTLS +ACL +XZ +LZ4 +SECCOMP +BLKID +ELFUTILS +KMOD -IDN2 +IDN default-hierarchy=hybrid
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