今天在阿里云 centos7 下，使用 sudo yum update 更新时，发生了如下错误提示：
error: NetworkManager-1:1.18.0-5.el7_7.1.x86_64: install failed
Updating : gdb-7.6.1-115.el7.x86_64 51/183
Updating : libcom_err-devel-1.42.9-16.el7.x86_64 52/183
Updating : krb5-devel-1.15.1-37.el7_7.2.x86_64 53/183
Error unpacking rpm package krb5-devel-1.15.1-37.el7_7.2.x86_64
error: unpacking of archive failed on file /usr/sbin/gss-server;5dfa47c0: cpio: open
Updating : rpm-build-4.11.3-40.el7.x86_64 54/183
error: krb5-devel-1.15.1-37.el7_7.2.x86_64: install failed
Updating : 1:NetworkManager-tui-1.18.0-5.el7_7.1.x86_64 55/183
Updating : policycoreutils-python-2.5-33.el7.x86_64 56/183
Error unpacking rpm package policycoreutils-python-2.5-33.el7.x86_64
error: unpacking of archive failed on file /usr/sbin/semanage;5dfa47c0: cpio: open
Updating : yum-3.4.3-163.el7.centos.noarch 57/183
error: policycoreutils-python-2.5-33.el7.x86_64: install failed
Updating : 7:device-mapper-event-1.02.158-2.el7_7.2.x86_64 58/183
Error unpacking rpm package 7:device-mapper-event-1.02.158-2.el7_7.2.x86_64
error: unpacking of archive failed on file /usr/sbin/dmeventd;5dfa47c0: cpio: open
Updating : 1:grub2-tools-extra-2.02-0.80.el7.centos.x86_64 59/183
Error unpacking rpm package 1:grub2-tools-extra-2.02-0.80.el7.centos.x86_64
error: device-mapper-event-7:1.02.158-2.el7_7.2.x86_64: install failed
error: unpacking of archive failed on file /usr/sbin/grub2-ofpathname;5dfa47c0: cpio: open
Updating : dnsmasq-2.76-10.el7_7.1.x86_64 60/183
Error unpacking rpm package dnsmasq-2.76-10.el7_7.1.x86_64
error: grub2-tools-extra-1:2.02-0.80.el7.centos.x86_64: install failed
error: unpacking of archive failed on file /usr/sbin/dnsmasq;5dfa47c0: cpio: open
Updating : audit-2.8.5-4.el7.x86_64 61/183
Error unpacking rpm package audit-2.8.5-4.el7.x86_64
error: dnsmasq-2.76-10.el7_7.1.x86_64: install failed
error: unpacking of archive failed on file /sbin/audispd;5dfa47c0: cpio: open
Updating : 12:dhclient-4.2.5-77.el7.centos.x86_64 62/183
Error unpacking rpm package 12:dhclient-4.2.5-77.el7.centos.x86_64
error: audit-2.8.5-4.el7.x86_64: install failed
error: unpacking of archive failed on file /usr/sbin/dhclient;5dfa47c0: cpio: open
Updating : tuned-2.11.0-5.el7_7.1.noarch 63/183
Error unpacking rpm package tuned-2.11.0-5.el7_7.1.noarch
看 error 信息，怀疑是目录属性的问题，所以查看了一下目录属性：
[root@ebs-64959 usr]# lsattr /usr
-------------e-- /usr/src
----i-----I--e-- /usr/sbin
-------------e-- /usr/lib
-------------e-- /usr/libexec
-------------e-- /usr/man
-------------e-- /usr/share
----------I--e-- /usr/bin
----------I--e-- /usr/lib64
----------I--e-- /usr/include
-------------e-- /usr/etc
-------------e-- /usr/local
-------------e-- /usr/games
可以发现，在/usr/sbin 中有 i 属性，这会导致目录被锁定，即便是管理员也无法被修改，所以需要使用如下命令来去除该属性：
[root@ebs-64959 usr]# chattr -i /usr/sbin
之后在重新执行 sudo yum update 命令
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