Centos 7 Firewall padrão não funciona

Question

Eu tenho um vps de godaddy e como eu menciono no artigo eu tenho centos 7 no meu sistema. As primeiras coisas que fiz quando iniciei o servidor são:

$ yum update
$  yum install firewalld
$  systemctl start firewalld
$ systemctl enable firewalld
$ firewall-cmd --state
not running

Eu tentei formatar várias vezes e outras coisas, mas ainda consigo isso.

Além disso, quando eu tento

$ firewall-cmd --reload
Error: COMMAND_FAILED

E esse é o status do firewalld

firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: active (running) since Sun 2017-12-17 04:31:45 MST; 23h ago
     Docs: man:firewalld(1)
 Main PID: 131 (firewalld)
   CGroup: /system.slice/firewalld.service
           └─131 /usr/bin/python -Es /usr/sbin/firewalld --nofork --nopid

Dec 17 04:34:37 s132-148-146-167.secureserver.net firewalld[131]: WARNING: '/usr/sbin/ebtables-restore --noflush' failed: The kernel doesn't support the ebtables 'broute' table.
Dec 17 04:34:37 s132-148-146-167.secureserver.net firewalld[131]: ERROR: COMMAND_FAILED
Dec 17 04:43:21 s132-148-146-167.secureserver.net firewalld[131]: WARNING: ALREADY_ENABLED: ftp
Dec 18 03:46:03 s132-148-146-167.secureserver.net firewalld[131]: WARNING: ipset not usable, disabling ipset usage in firewall.
Dec 18 03:46:03 s132-148-146-167.secureserver.net firewalld[131]: ERROR: Failed to read file "/proc/sys/net/netfilter/nf_conntrack_helper": [Errno 2] No such file or directory: '/proc/sys/net/netfilter/nf_conntrack_helper'
Dec 18 03:46:03 s132-148-146-167.secureserver.net firewalld[131]: WARNING: Failed to get and parse nf_conntrack_helper setting
Dec 18 03:46:03 s132-148-146-167.secureserver.net firewalld[131]: WARNING: INVALID_HELPER: 'nf_conntrack_ftp' is not available
Dec 18 03:46:03 s132-148-146-167.secureserver.net firewalld[131]: WARNING: '/usr/sbin/iptables-restore --wait=2 -n' failed: iptables-restore: line 64 failed
Dec 18 03:46:03 s132-148-146-167.secureserver.net firewalld[131]: WARNING: '/usr/sbin/ebtables-restore --noflush' failed: The kernel doesn't support the ebtables 'broute' table.
Dec 18 03:46:03 s132-148-146-167.secureserver.net firewalld[131]: ERROR: COMMAND_FAILED

Por favor ajude. Estou fazendo algo errado ou falta? Esse é um erro de firewall padrão no meu sistema operacional? Devo culpar o GoDaddy por isso?

Erros que vi no log do firewalld;

WARNING: ip6tables not usable, disabling IPv6 firewall.
WARNING: ICMP type 'reject-route' is not supported by the kernel for ipv6.

    

Answer 1

Eu acho que você tem problemas relacionados a ebtables. Por favor, verifique se você tem ebtables instalado e verificado.

rpm -V ebtables -v           (You can check meanings of output on rpm man page)

Tente reiniciar os serviços e verificar o status por journalctl

systemctl restart ebtables
journalctl -u ebtables.service

systemctl restart firewalld
journalctl -u firewalld.service

Observação: também journalctl -u firewalld.service será mais útil para problemas de depuração.

    

Answer 2

Se o serviço FTP estiver usando a porta de controle padrão de FTP de 21, tudo o que você precisa fazer é carregar o módulo nf_conntrack_ftp.

Para tornar persistente durante o uso da reinicialização:

# cat /etc/modules-load.d/nf_conntrack_ftp.conf 
nf_conntrack_ftp

    

Answer 3

Meu erro:

[root@localhost ~]# systemctl status firewalld
● firewalld.service - firewalld - dynamic firewall daemon
   Loaded: loaded (/usr/lib/systemd/system/firewalld.service; enabled; vendor preset: enabled)
   Active: inactive (dead) since Mon 2018-12-17 13:38:24 CST; 1min 51s ago
     Docs: man:firewalld(1)
  Process: 6491 ExecStart=/usr/sbin/firewalld --nofork --nopid $FIREWALLD_ARGS (code=exited, status=0/SUCCESS)
 Main PID: 6491 (code=exited, status=0/SUCCESS)

Dec 17 13:38:24 localhost.localdomain systemd[1]: Starting firewalld - dynamic firewall daemon...
Dec 17 13:38:24 localhost.localdomain systemd[1]: Started firewalld - dynamic firewall daemon.
Dec 17 13:38:24 localhost.localdomain firewalld[6491]: WARNING: ipset not usable, disabling ipset usage in firewall.
Dec 17 13:38:24 localhost.localdomain firewalld[6491]: ERROR: Failed to read file "/proc/sys/net/netfilter/nf_conntrack_helper": [Errno …_helper'
Dec 17 13:38:24 localhost.localdomain firewalld[6491]: WARNING: Failed to get and parse nf_conntrack_helper setting
Dec 17 13:38:24 localhost.localdomain firewalld[6491]: WARNING: iptables not usable, disabling IPv4 firewall.
Dec 17 13:38:24 localhost.localdomain firewalld[6491]: WARNING: ip6tables not usable, disabling IPv6 firewall.
Dec 17 13:38:24 localhost.localdomain firewalld[6491]: WARNING: ebtables not usable, disabling ethernet bridge firewall.
Dec 17 13:38:24 localhost.localdomain firewalld[6491]: FATAL ERROR: No IPv4 and IPv6 firewall.
Dec 17 13:38:24 localhost.localdomain firewalld[6491]: ERROR: Raising SystemExit in run_server

[root@localhost ~]# iptables -L -n
iptables v1.4.21: can't initialize iptables table 'filter': Table does not exist (do you need to insmod?)
Perhaps iptables or your kernel needs to be upgraded.

Minha solução:

[root@localhost ~]# depmod
[root@localhost ~]# systemctl restart firewalld