I have try this on redhat 7systemctl list-unit-files --type=service|grep iptablesorsystemctl list-unit-files --type=service|grep firewallbut not get any output - is this mean the iptables/firewall deleted from systemctl  ?I see also that iptables installed on my linux redhat# rpm -qa |grep iptablesiptables-1.4.21-16.el7.x86_64
redhat 7 + systemctl verification
rhel;chkconfig
the commandsystemctl list-unit-files --type=service|grep iptablesNot display the iptables because iptables-services is not installed!To installed the iptables service need to perform yum install iptables-servicesyum install iptables-servicesLoaded plugins: product-id, search-disabled-repos, subscription-managerThis system is not registered to Red Hat Subscription Management. You can    use subscription-manager to register.Resolving Dependencies --> Running transaction check ---> Package iptables-services.x86_64 0:1.4.21-16.el7 will be installed --> Finished Dependency Resolution Dependencies Resolved ================================================================================================================================================================ Package                                     Arch                                 Version                                   Repository                            Size================================================================================================================================================================Installing:iptables-services                           x86_64                              1.4.21-16.el7                             updates                            50    kTransaction Summary ================================================================================    ================================================================================ Install  1 PackageTotal download size: 50 kInstalled size: 24 kIs this ok [y/d/N]: yDownloading packages:iptables-services-1.4.21-16.el7.x86_64.rpm                                                                                                 |  50 kB  00:00:00Running transaction checkRunning transaction testTransaction test succeededRunning transactionInstalling : iptables-services-1.4.21-16.el7.x86_64                                                                                                         1/1  Verifying  : iptables-services-1.4.21-16.el7.x86_64                                                                                                         1/1Installed:iptables-services.x86_64 0:1.4.21-16.el7Complete!now  systemctl show it -:)  # systemctl list-unit-files --type=service|grep iptables  iptables.service                       disabled