Add NAT64 to enable IPv6 provision in v4 only host #1567
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,8 @@ | ||
| nat64_action: setup | ||
| ENABLE_NAT64: "{{ lookup('env', 'ENABLE_NAT64') | default('false', true) }}" | ||
| TEMPLATES_PATH: "{{ metal3_dir }}/vm-setup/roles/nat64/files" | ||
| DNS_UPSTREAM: "{{ lookup('env', 'DNS_UPSTREAM') | default('10.1.0.2', true) }}" | ||
| DNS64_PREFIX: "{{ lookup('env', 'DNS64_PREFIX') | default('fd00:ffff:ffff::/96', true) }}" | ||
| # Local DNS is only used in IPv6 only env | ||
| LOCAL_DNS_V4: "{{ lookup('env', 'LOCAL_DNS_V4') | default('127.0.0.2', true) }}" | ||
| LOCAL_DNS_V6: "{{ lookup('env', 'LOCAL_DNS_V6') | default('2001:4860:4860::8888', true) }}" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,17 @@ | ||
| - name: Install IPv6 only required packages | ||
| package: | ||
| name: | ||
| - tayga | ||
| - bind9 | ||
| state: present | ||
| when: nat64_action == "setup" | ||
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| - name: Setup NAT64 | ||
| block: | ||
| - include_tasks: setup_nat.yml | ||
| when: nat64_action == "setup" | ||
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| - name: Teardown NAT64 | ||
| block: | ||
| - include_tasks: teardown_nat.yml | ||
| when: nat64_action == "teardown" |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,76 @@ | ||
| # Libvirt needs dnsmasq to manage networks. Installing it will likely automatically | ||
| # enable global dnsmasq. We don't want it. | ||
| - name: Ensure dnsmasq is stopped | ||
| ansible.builtin.systemd_service: | ||
| state: stopped | ||
| name: dnsmasq | ||
| become: yes | ||
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| - name: Write Tayga configuration | ||
| template: | ||
| src: "../templates/tayga.conf" | ||
| dest: "/etc/tayga.conf" | ||
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| - name: ensure IP forwarding is on | ||
| shell: | | ||
| sysctl net.ipv4.ip_forward=1 | ||
| sysctl net.ipv6.conf.all.forwarding=1 | ||
| become: yes | ||
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| - name: Start NAT64 service tayga | ||
| ansible.builtin.systemd_service: | ||
| state: started | ||
| name: tayga | ||
| become: yes | ||
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| - name: Generate Bind9 options file | ||
| template: | ||
| src: "../templates/named.conf.options" | ||
| dest: /etc/bind/named.conf.options | ||
| owner: root | ||
| group: root | ||
| mode: '0644' | ||
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| # IPv6 only supported on ubuntu, so assume that systemd-resolved is | ||
| # the default dns resolution | ||
| - name: Disable systemd-resolved | ||
| ansible.builtin.systemd_service: | ||
| state: stopped | ||
| name: systemd-resolved | ||
| become: yes | ||
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| - name: Write /etc/resolv.conf to contain local DNS server | ||
| template: | ||
| src: "../templates/resolv.conf" | ||
| dest: /etc/resolv.conf | ||
| owner: root | ||
| group: root | ||
| mode: '0644' | ||
| backup: true | ||
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| # Note that if the address is regular 127.0.0.1, then this will add a duplicate | ||
| # address to the interface but with different subnet mask, the default | ||
| # subnetmask is 8 for IPv4 and | ||
| - name: Add DNS-server IPv4-address to loopback interface | ||
| shell: | ||
| cmd: "ip addr add {{ LOCAL_DNS_V4 }}/32 dev lo" | ||
| become: yes | ||
| ignore_errors: true | ||
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| - name: Add DNS-server IPv6-address to loopback interface | ||
| shell: | ||
| cmd: "ip addr add {{ LOCAL_DNS_V6 }}/128 dev lo" | ||
| become: yes | ||
| ignore_errors: true | ||
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| - name: Restart Bind9 service | ||
| ansible.builtin.systemd_service: | ||
| state: restarted | ||
| daemon_reload: true | ||
| name: named.service | ||
| become: yes | ||
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| - name: Add local hostname to /etc/hosts | ||
| ansible.builtin.lineinfile: | ||
| path: /etc/hosts | ||
| line: 127.0.0.1 {{ ansible_hostname }} |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,23 @@ | ||
| - name: Stop NAT64 service tayga | ||
| ansible.builtin.systemd_service: | ||
| state: stopped | ||
| name: tayga | ||
| become: yes | ||
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| - name: Clean NAT64 interface | ||
| shell: | | ||
| ip link del nat64 | ||
| become: yes | ||
| ignore_errors: true | ||
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| - name: Delete DNS-server IPv4-address from loopback interface | ||
| shell: | ||
| cmd: "ip addr del {{ LOCAL_DNS_V4 }}/32 dev lo" | ||
| become: yes | ||
| ignore_errors: true | ||
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| - name: Delete DNS-server IPv6-address from loopback interface | ||
| shell: | ||
| cmd: "ip addr del {{ LOCAL_DNS_V6 }}/128 dev lo" | ||
| become: yes | ||
| ignore_errors: true | ||
|
There was a problem hiding this comment. We could also add IPv4 and IPv6 addresses to the tunnel device in order to enable sending of ICMP(v6) messages. It is a stupid that the need to be added manually, because they also need to be specified in the tayga configuration file. Well, life is.
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Author
There was a problem hiding this comment. Yeah, that would be good, but again, I feel that introducing any extra complexity at this point is not really needed. |
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Is there an original setup where we would prefer using CLUSTER_APIENDPOINT_HOST?
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This is rather annoying. Using host would be usually the way to go, but in this case if we add the brackets around IPv6 address to make it look like host, kubeadm errors and the cluster does not get connection.
Also, host names are not used anywhere, so it should not be a problem to use ATM, but of course moving to use host names later would be annoying.