pve/scripts/build_nat_network.sh

#!/bin/bash
# from 
# https://github.com/spiritLHLS/pve
# 2023.08.03


########## 预设部分输出和部分中间变量

_red() { echo -e "\033[31m\033[01m$@\033[0m"; }
_green() { echo -e "\033[32m\033[01m$@\033[0m"; }
_yellow() { echo -e "\033[33m\033[01m$@\033[0m"; }
_blue() { echo -e "\033[36m\033[01m$@\033[0m"; }
reading(){ read -rp "$(_green "$1")" "$2"; }
export DEBIAN_FRONTEND=noninteractive
utf8_locale=$(locale -a 2>/dev/null | grep -i -m 1 -E "UTF-8|utf8")
if [[ -z "$utf8_locale" ]]; then
  echo "No UTF-8 locale found"
else
  export LC_ALL="$utf8_locale"
  export LANG="$utf8_locale"
  export LANGUAGE="$utf8_locale"
  echo "Locale set to $utf8_locale"
fi
rm -rf /usr/local/bin/build_backend_pve.txt

########## 查询信息

if ! command -v lshw > /dev/null 2>&1; then
        apt-get install -y lshw
fi
if ! command -v ipcalc > /dev/null 2>&1; then
        apt-get install -y ipcalc
fi

# 检测IPV6相关的信息
if [ -f /usr/local/bin/pve_check_ipv6 ]; then
    ipv6_address=$(cat /usr/local/bin/pve_check_ipv6)
fi
if [ -f /usr/local/bin/pve_ipv6_prefixlen ]; then
    ipv6_prefixlen=$(cat /usr/local/bin/pve_ipv6_prefixlen)
fi
if [ -f /usr/local/bin/pve_ipv6_gateway ]; then
    ipv6_gateway=$(cat /usr/local/bin/pve_ipv6_gateway)
fi

# 录入网关
if [ ! -f /etc/network/interfaces.bak ]; then
    cp /etc/network/interfaces /etc/network/interfaces.bak
fi
# 修正部分网络设置重复的错误
if [[ -f "/etc/network/interfaces.d/50-cloud-init" && -f "/etc/network/interfaces" ]]; then
    if grep -q "auto lo" "/etc/network/interfaces.d/50-cloud-init" && grep -q "iface lo inet loopback" "/etc/network/interfaces.d/50-cloud-init" && grep -q "auto lo" "/etc/network/interfaces" && grep -q "iface lo inet loopback" "/etc/network/interfaces"; then
        # 从 /etc/network/interfaces.d/50-cloud-init 中删除重复的行
        chattr -i /etc/network/interfaces.d/50-cloud-init
        sed -i '/auto lo/d' "/etc/network/interfaces.d/50-cloud-init"
        sed -i '/iface lo inet loopback/d' "/etc/network/interfaces.d/50-cloud-init"
        chattr +i /etc/network/interfaces.d/50-cloud-init
    fi
fi
if [ -f "/etc/network/interfaces.new" ];then
    chattr -i /etc/network/interfaces.new
    rm -rf /etc/network/interfaces.new
fi
interfaces_file="/etc/network/interfaces"
chattr -i "$interfaces_file"
if ! grep -q "auto lo" "$interfaces_file"; then
    _blue "Can not find 'auto lo' in ${interfaces_file}"
    exit 1
fi
if ! grep -q "iface lo inet loopback" "$interfaces_file"; then
    _blue "Can not find 'iface lo inet loopback' in ${interfaces_file}"
    exit 1
fi
if grep -q "vmbr1" "$interfaces_file"; then
    _blue "vmbr1 already exists in ${interfaces_file}"
    _blue "vmbr1 已存在在 ${interfaces_file}"
elif [ -f "/usr/local/bin/iface_auto.txt" ]; then
cat << EOF | sudo tee -a "$interfaces_file"
auto vmbr1
iface vmbr1 inet static
    address 172.16.1.1
    netmask 255.255.255.0
    bridge_ports none
    bridge_stp off
    bridge_fd 0
    post-up echo 1 > /proc/sys/net/ipv4/ip_forward
    post-up echo 1 > /proc/sys/net/ipv4/conf/vmbr1/proxy_arp
    post-up iptables -t nat -A POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE
    post-down iptables -t nat -D POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE

pre-up echo 2 > /proc/sys/net/ipv6/conf/vmbr0/accept_ra
EOF
elif [ -z "$ipv6_address" ] || [ -z "$ipv6_prefixlen" ] || [ -z "$ipv6_gateway" ]; then
cat << EOF | sudo tee -a "$interfaces_file"
auto vmbr1
iface vmbr1 inet static
    address 172.16.1.1
    netmask 255.255.255.0
    bridge_ports none
    bridge_stp off
    bridge_fd 0
    post-up echo 1 > /proc/sys/net/ipv4/ip_forward
    post-up echo 1 > /proc/sys/net/ipv4/conf/vmbr1/proxy_arp
    post-up iptables -t nat -A POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE
    post-down iptables -t nat -D POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE
EOF
else
cat << EOF | sudo tee -a "$interfaces_file"
auto vmbr1
iface vmbr1 inet static
    address 172.16.1.1
    netmask 255.255.255.0
    bridge_ports none
    bridge_stp off
    bridge_fd 0
    post-up echo 1 > /proc/sys/net/ipv4/ip_forward
    post-up echo 1 > /proc/sys/net/ipv4/conf/vmbr1/proxy_arp
    post-up iptables -t nat -A POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE
    post-down iptables -t nat -D POSTROUTING -s '172.16.1.0/24' -o vmbr0 -j MASQUERADE

iface vmbr1 inet6 static
    address 2001:db8:1::1/64
    post-up sysctl -w net.ipv6.conf.all.forwarding=1
    post-up ip6tables -t nat -A POSTROUTING -s 2001:db8:1::/64 -o vmbr0 -j MASQUERADE
    post-down sysctl -w net.ipv6.conf.all.forwarding=0
    post-down ip6tables -t nat -D POSTROUTING -s 2001:db8:1::/64 -o vmbr0 -j MASQUERADE
EOF
fi
chattr +i "$interfaces_file"
rm -rf /usr/local/bin/iface_auto.txt

# 加载iptables并设置回源且允许NAT端口转发
apt-get install -y iptables iptables-persistent
iptables -t nat -A POSTROUTING -j MASQUERADE
sysctl net.ipv4.ip_forward=1
sysctl_path=$(which sysctl)
if grep -q "^net.ipv4.ip_forward=1" /etc/sysctl.conf; then
  if grep -q "^#net.ipv4.ip_forward=1" /etc/sysctl.conf; then
    sed -i 's/^#net.ipv4.ip_forward=1/net.ipv4.ip_forward=1/' /etc/sysctl.conf
  fi
else
    echo "net.ipv4.ip_forward=1" >> /etc/sysctl.conf
fi
${sysctl_path} -p

# 重启配置
service networking restart
systemctl restart networking.service
sleep 3
ifreload -ad
# 已加载网络，删除对应缓存文件
if [ -f "/etc/network/interfaces.new" ];then
    chattr -i /etc/network/interfaces.new
    rm -rf /etc/network/interfaces.new
fi
systemctl start check-dns.service
# _green "Although the gateway has been set automatically, I am not sure if it has been applied successfully, please check in Datacenter-->pve-->System-->Network in PVE"
# _green "If vmbr0 and vmbr1 are displayed properly and the Apply Configuration button is grayed out, there is no need to reboot"
# _green "If the above scenario is different, click on the Apply Configuration button, wait a few minutes and reboot the system to ensure that the gateway has been successfully applied"
_green "you can test open a virtual machine or container to see if the actual network has been applied successfully"
# _green "虽然已自动设置网关，但不确定是否已成功应用，请查看PVE中的 Datacenter-->pve-->System-->Network"
# _green "如果 vmbr0 和 vmbr1 已正常显示且 Apply Configuration 这个按钮是灰色的，则不用执行 reboot 重启系统"
# _green "上述情形如果有不同的，请点击 Apply Configuration 这个按钮，等待几分钟后重启系统，确保网关已成功应用"
_green "你可以测试开一个虚拟机或者容器看看就知道是不是实际网络已应用成功了"