当时只是想把防火墙都关掉，关不掉的卸载掉。
结果我没有选择iptables -F，选择了yum remove iptables!!
之后service命令没有了。。。。
还有很多东西都消失了，所以重装吧。。
删除iptables的时候：
删除:
iptables.x86_64 0:1.4.21-16.el7
作为依赖被删除:
NetworkManager.x86_64 1:1.0.6-27.el7 NetworkManager-adsl.x86_64 1:1.0.6-27.el7
NetworkManager-libreswan.x86_64 0:1.0.6-3.el7 NetworkManager-libreswan-gnome.x86_64 0:1.0.6-3.el7
NetworkManager-team.x86_64 1:1.0.6-27.el7 NetworkManager-tui.x86_64 1:1.0.6-27.el7
abrt-addon-vmcore.x86_64 0:2.1.11-36.el7.centos abrt-cli.x86_64 0:2.1.11-36.el7.centos
abrt-console-notification.x86_64 0:2.1.11-36.el7.centos abrt-desktop.x86_64 0:2.1.11-36.el7.centos
anaconda-core.x86_64 0:21.48.22.56-5.el7.centos anaconda-tui.x86_64 0:21.48.22.56-5.el7.centos
apr-util-devel.x86_64 0:1.5.2-6.el7 cyrus-sasl.x86_64 0:2.1.26-19.2.el7
cyrus-sasl-devel.x86_64 0:2.1.26-19.2.el7 device-mapper-multipath.x86_64 0:0.4.9-85.el7
dhclient.x86_64 12:4.2.5-42.el7.centos dracut-network.x86_64 0:033-359.el7
fcoe-utils.x86_64 0:1.0.30-3.git91c0c8c.el7 firewall-config.noarch 0:0.3.9-14.el7
firewalld.noarch 0:0.3.9-14.el7 gnome-boxes.x86_64 0:3.14.3.1-7.el7
gnome-color-manager.x86_64 0:3.14.2-1.el7 gnome-terminal.x86_64 0:3.14.3-3.el7
httpd-devel.x86_64 0:2.4.6-40.el7.centos initial-setup.x86_64 0:0.3.9.30-1.el7.centos
initscripts.x86_64 0:9.49.30-1.el7 ipa-client.x86_64 0:4.2.0-15.el7.centos
ipa-python.x86_64 0:4.2.0-15.el7.centos iproute.x86_64 0:3.10.0-54.el7
iptables-devel.x86_64 0:1.4.21-16.el7 kbd.x86_64 0:1.15.5-11.el7
kexec-tools.x86_64 0:2.0.7-38.el7 libguestfs.x86_64 1:1.28.1-1.55.el7.centos
libreswan.x86_64 0:3.12-10.1.el7_1 libstoragemgmt.x86_64 0:1.2.3-4.el7
libstoragemgmt-python.noarch 0:1.2.3-4.el7 libvirt.x86_64 0:1.2.17-13.el7
libvirt-client.x86_64 0:1.2.17-13.el7 libvirt-daemon.x86_64 0:1.2.17-13.el7
libvirt-daemon-config-network.x86_64 0:1.2.17-13.el7 libvirt-daemon-config-nwfilter.x86_64 0:1.2.17-13.el7
libvirt-daemon-driver-interface.x86_64 0:1.2.17-13.el7 libvirt-daemon-driver-lxc.x86_64 0:1.2.17-13.el7
libvirt-daemon-driver-network.x86_64 0:1.2.17-13.el7 libvirt-daemon-driver-nodedev.x86_64 0:1.2.17-13.el7
libvirt-daemon-driver-nwfilter.x86_64 0:1.2.17-13.el7 libvirt-daemon-driver-qemu.x86_64 0:1.2.17-13.el7
libvirt-daemon-driver-secret.x86_64 0:1.2.17-13.el7 libvirt-daemon-driver-storage.x86_64 0:1.2.17-13.el7
libvirt-daemon-kvm.x86_64 0:1.2.17-13.el7 libvirt-glib.x86_64 0:0.1.9-1.el7
libvirt-gobject.x86_64 0:0.1.9-1.el7 libvirt-python.x86_64 0:1.2.17-2.el7
lvm2-sysvinit.x86_64 7:2.02.130-5.el7_2.1 nfs-utils.x86_64 1:1.3.0-0.21.el7
numad.x86_64 0:0.5-14.20140620git.el7 open-vm-tools.x86_64 0:9.10.2-4.el7
open-vm-tools-desktop.x86_64 0:9.10.2-4.el7 openldap-devel.x86_64 0:2.4.40-8.el7
pcp.x86_64 0:3.10.6-2.el7 pcp-compat.x86_64 0:3.10.6-2.el7
pcp-export-pcp2graphite.x86_64 0:3.10.6-2.el7 pcp-pmda-gluster.x86_64 0:3.10.6-2.el7
pcp-pmda-json.x86_64 0:3.10.6-2.el7 pcp-pmda-lustrecomm.x86_64 0:3.10.6-2.el7
pcp-pmda-roomtemp.x86_64 0:3.10.6-2.el7 pcp-pmda-rpm.x86_64 0:3.10.6-2.el7
pcp-pmda-sendmail.x86_64 0:3.10.6-2.el7 pcp-pmda-summary.x86_64 0:3.10.6-2.el7
pcp-pmda-unbound.x86_64 0:3.10.6-2.el7 pcp-pmda-weblog.x86_64 0:3.10.6-2.el7
pcp-pmda-zswap.x86_64 0:3.10.6-2.el7 pcp-system-tools.x86_64 0:3.10.6-2.el7
plymouth.x86_64 0:0.8.9-0.24.20140113.el7.centos plymouth-plugin-label.x86_64 0:0.8.9-0.24.20140113.el7.centos
plymouth-plugin-two-step.x86_64 0:0.8.9-0.24.20140113.el7.centos plymouth-scripts.x86_64 0:0.8.9-0.24.20140113.el7.centos
plymouth-system-theme.x86_64 0:0.8.9-0.24.20140113.el7.centos plymouth-theme-charge.x86_64 0:0.8.9-0.24.20140113.el7.centos
pm-utils.x86_64 0:1.4.1-27.el7 python-blivet.noarch 1:0.61.15.37-1.el7
python-pcp.x86_64 0:3.10.6-2.el7 quota.x86_64 1:4.01-11.el7
vinagre.x86_64 0:3.14.3-1.el7 virt-install.noarch 0:1.2.1-8.el7
virt-manager.noarch 0:1.2.1-8.el7 virt-manager-common.noarch 0:1.2.1-8.el7
virt-top.x86_64 0:1.0.8-8.el7 virt-viewer.x86_64 0:2.0-6.el7
vte291.x86_64 0:0.38.3-2.el7 vte3.x86_64 0:0.36.4-1.el7 