Docker中的pptpd在容器重新启动后停止工作

我通过这个Dockerfilebuild立一个docker镜像 ：

# # Dockerfile for pptpd # FROM debian:jessie MAINTAINER kev<[e-mail]> RUN apt-get update \ && apt-get install -y iptables pptpd \ && rm -rf /var/lib/apt/lists/* COPY pptpd.conf /etc/ COPY chap-secrets /etc/ppp/ COPY pptpd-options /etc/ppp/ EXPOSE 1723 CMD iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE \ && pptpd --fg 

在重启之前

 $ docker pull vimagick/pptpd $ docker run -d --name pptpd_pptpd_1 -p 1723:1723 --privileged vimagick/pptpd $ tcpdump -ni eth0 proto gre 13:21:16.877858 IP 1.2.3.4 > 5.6.7.8: GREv1, call 16501, seq 0, length 40: LCP, Conf-Request (0x01), id 1, length 26 13:21:16.944894 IP 5.6.7.8 > 1.2.3.4: GREv1, call 512, seq 0, length 40: LCP, Conf-Request (0x01), id 1, length 26 13:21:16.945002 IP 1.2.3.4 > 5.6.7.8: GREv1, call 16501, seq 1, ack 0, length 44: LCP, Conf-Ack (0x02), id 1, length 26 13:21:16.945932 IP 5.6.7.8 > 1.2.3.4: GREv1, call 512, seq 1, length 25: LCP, Conf-Nack (0x03), id 1, length 11 13:21:16.946006 IP 1.2.3.4 > 5.6.7.8: GREv1, call 16501, seq 2, ack 1, length 45: LCP, Conf-Request (0x01), id 2, length 27 13:21:16.984018 IP 5.6.7.8 > 1.2.3.4: GREv1, call 512, seq 2, length 41: LCP, Conf-Ack (0x02), id 2, length 27 13:21:16.984224 IP 1.2.3.4 > 5.6.7.8: GREv1, call 16501, seq 3, ack 2, length 26: LCP, Echo-Request (0x09), id 0, length 10 

重启后

 $ docker restart pptpd_pptpd_1 $ tcpdump -ni eth0 proto gre 13:31:32.071308 IP 5.6.7.8 > 1.2.3.4: GREv1, call 256, seq 0, length 40: LCP, Conf-Request (0x01), id 1, length 26 13:31:35.123217 IP 5.6.7.8 > 1.2.3.4: GREv1, call 256, seq 1, length 40: LCP, Conf-Request (0x01), id 1, length 26 13:31:40.112179 IP 5.6.7.8 > 1.2.3.4: GREv1, call 256, seq 2, length 40: LCP, Conf-Request (0x01), id 1, length 26 13:31:41.111172 IP 5.6.7.8 > 1.2.3.4: GREv1, call 256, seq 3, length 40: LCP, Conf-Request (0x01), id 1, length 26 

• 服务器：
  • eth0：1.2.3.4
  • docker0：192.168.42.1
• 客户端：5.6.7.8

我注意到在重启后，容器的ip改变了（192.168.42.2 – > 192.168.42.3）。
我启用/禁用防火墙，结果是一样的。
我需要一个iptables的规则，使其再次工作？ 谢谢！

---

更新：我可以附加--net host选项来解决这个问题。

Answer 1

当我编辑/etc/default/ufw ，它给了我一些提示：

 # Extra connection tracking modules to load. Complete list can be found in # net/netfilter/Kconfig of your kernel source. Some common modules: # nf_conntrack_irc, nf_nat_irc: DCC (Direct Client to Client) support # nf_conntrack_netbios_ns: NetBIOS (samba) client support # nf_conntrack_pptp, nf_nat_pptp: PPTP over stateful firewall/NAT # nf_conntrack_ftp, nf_nat_ftp: active FTP support # nf_conntrack_tftp, nf_nat_tftp: TFTP support (server side) IPT_MODULES="nf_conntrack_ftp nf_nat_ftp nf_conntrack_netbios_ns" 

在我运行下面的命令后，每一件事都恢复正常。

 modprobe nf_conntrack_pptp nf_nat_pptp