Hcloud Classic Network Manager

• Features

  • Subnet Management
  • Master Node DHCP Management
  • Configure network interfaces of Master Node
  • Allocate Adaptive IP (Allocate public IP address to private IP address.)

• Supported OS

  • Linux

• Pre-required

  • SELinux disabled (If enabled, iptables will not work correctly.)
  • If you have apparmor installed, you should add an allow line to apparmor config. WARNING: If you make harp config directory as a symbolic link, you must also allow the target directory.
    • vi /etc/apparmor.d/usr.sbin.dhcpd

    /etc/hcc/harp/dhcpd/config/*.conf lrw,
    

    • Restart apparmor

    service apparmor restart
    

  • iptables installed with NAT kernel module loaded (iptable_nat, nf_nat)
  • Golang installed
  • 2 network interfaces for use an external network and internal networks.

• How to build
  • Just run make command.

• How to run

  1. Copy harp.conf and harp_adaptiveip_network.conf to /etc/hcc/harp/harp.conf
  2. Change your settings in harp.conf and harp_adaptiveip_network.conf
  3. Run harp binary.
  
  

• How it allocates public IP addresses.

  1. Get server's UUID and public IP address from user.
  2. Check if provided server's UUID is already used in Adaptive IP.
  3. Get the private subnet information related with sever.
  4. Get the first IP address. (End with x.x.x.1. This is Leader Node's IP address.)
  5. Create NAT firewall rules.
  6. Server's nodes are now connect to Internet and can connect from external network by provided public IP address.
  
  

• How it listing available public IP addresses.

  1. Make a array from start IP address to end IP address that configured as Adaptive IP range in harp.conf.
  2. Check from start IP address to end IP. First, check if the IP address is configure to external network interface.
  3. Second, send ARP request. If it received ARP reply, then the IP address is duplicate with someone.
  4. Show the available IP addresses except in 2 and 3 .

• See configuration comments in .go files located in ./lib/config/.