接上一篇 docker 容器安全与 firewalld;为了正常使用docker容器和firewalld,而不修改docker的daemon.json,按如下步骤个性firewalld规则,其本质上是修改ptables规则,修改完成后可以用iptables -nL
查看。
1. Recreate DOCKER-USER iptables chain with firewalld. Ignore warnings, do not ignore errors
firewall-cmd --permanent --direct --remove-chain ipv4 filter DOCKER-USER
firewall-cmd --permanent --direct --remove-rules ipv4 filter DOCKER-USER
firewall-cmd --permanent --direct --add-chain ipv4 filter DOCKER-USER
##2. Add iptables rules to DOCKER-USER chain - unrestricted outbound, restricted inbound to private IPs
firewall-cmd --permanent --direct --add-rule ipv4 filter DOCKER-USER 1 -m conntrack --ctstate RELATED,ESTABLISHED -j ACCEPT -m comment --comment 'Allow containers to connect to the outside world'
firewall-cmd --permanent --direct --add-rule ipv4 filter DOCKER-USER 1 -j RETURN -s 127.0.0.0/8 -m comment --comment 'allow internal docker communication, loopback addresses'
firewall-cmd --permanent --direct --add-rule ipv4 filter DOCKER-USER 1 -j RETURN -s 10.0.0.0/8 -m comment --comment 'allow internal docker communication, private range'
firewall-cmd --permanent --direct --add-rule ipv4 filter DOCKER-USER 1 -j RETURN -s 172.16.0.0/12 -m comment --comment 'allow internal docker communication, private range'
firewall-cmd --permanent --direct --add-rule ipv4 filter DOCKER-USER 1 -j RETURN -s 192.168.0.0/16 -m comment --comment 'allow internal docker communication, private range'
3. Block all other IPs. This rule has lowest precedence, so you can add rules before this one later.
firewall-cmd --permanent --direct --add-rule ipv4 filter DOCKER-USER 10 -j REJECT -m comment --comment 'reject all other traffic to DOCKER-USER'
4. Activate rules
firewall-cmd --reload
5. Start Docker
systemctl restart docker