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Merge pull request #4190 from juanluisvaladas/keepalived-vrrp
Implement VIPs using Keepalived vrrp_instances
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,20 @@ | ||
| ARG BUILDIMAGE | ||
| FROM $BUILDIMAGE AS build | ||
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| RUN apk add build-base curl \ | ||
| linux-headers \ | ||
| openssl-dev openssl-libs-static \ | ||
| libnl3-dev libnl3-static | ||
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| ARG VERSION | ||
| RUN curl -L https://www.keepalived.org/software/keepalived-$VERSION.tar.gz \ | ||
| | tar -C / -zx | ||
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| RUN cd /keepalived-$VERSION \ | ||
| && CFLAGS='-static -s' LDFLAGS=-static ./configure --disable-dynamic-linking \ | ||
| && make -j$(nproc) | ||
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| FROM scratch | ||
| ARG VERSION | ||
| COPY --from=build /keepalived-$VERSION/bin/keepalived \ | ||
| /bin/keepalived |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,159 @@ | ||
| // Copyright 2024 k0s authors | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| package keepalived | ||
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| import ( | ||
| "context" | ||
| "fmt" | ||
| "strconv" | ||
| "strings" | ||
| "testing" | ||
| "time" | ||
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| "github.com/k0sproject/k0s/inttest/common" | ||
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| "github.com/stretchr/testify/suite" | ||
| ) | ||
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| type keepalivedSuite struct { | ||
| common.BootlooseSuite | ||
| } | ||
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| const haControllerConfig = ` | ||
| spec: | ||
| api: | ||
| externalAddress: %s | ||
| network: | ||
| controlPlaneLoadBalancing: | ||
| vrrpInstances: | ||
| - virtualIPs: ["%s/24"] | ||
| authPass: "123456" | ||
| ` | ||
|
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| // SetupTest prepares the controller and filesystem, getting it into a consistent | ||
| // state which we can run tests against. | ||
| func (s *keepalivedSuite) TestK0sGetsUp() { | ||
| ipAddress := s.getLBAddress() | ||
| ctx := s.Context() | ||
| var joinToken string | ||
|
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| for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ { | ||
| s.Require().NoError(s.WaitForSSH(s.ControllerNode(idx), 2*time.Minute, 1*time.Second)) | ||
| s.PutFile(s.ControllerNode(idx), "/tmp/k0s.yaml", fmt.Sprintf(haControllerConfig, ipAddress, ipAddress)) | ||
|
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| // Note that the token is intentionally empty for the first controller | ||
| s.Require().NoError(s.InitController(idx, "--config=/tmp/k0s.yaml", "--disable-components=metrics-server", joinToken)) | ||
| s.Require().NoError(s.WaitJoinAPI(s.ControllerNode(idx))) | ||
|
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| // With the primary controller running, create the join token for subsequent controllers. | ||
| if idx == 0 { | ||
| token, err := s.GetJoinToken("controller") | ||
| s.Require().NoError(err) | ||
| joinToken = token | ||
| } | ||
| } | ||
|
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| // Final sanity -- ensure all nodes see each other according to etcd | ||
| for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ { | ||
| s.Require().Len(s.GetMembers(idx), s.BootlooseSuite.ControllerCount) | ||
| } | ||
|
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| // Create a worker join token | ||
| workerJoinToken, err := s.GetJoinToken("worker") | ||
| s.Require().NoError(err) | ||
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| // Start the workers using the join token | ||
| s.Require().NoError(s.RunWorkersWithToken(workerJoinToken)) | ||
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| client, err := s.KubeClient(s.ControllerNode(0)) | ||
| s.Require().NoError(err) | ||
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| s.Require().NoError(s.WaitForNodeReady(s.WorkerNode(0), client)) | ||
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| // Verify that all servers have the dummy interface | ||
| for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ { | ||
| s.checkDummy(ctx, s.ControllerNode(idx), ipAddress) | ||
| } | ||
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| // Verify that only one controller has the VIP in eth0 | ||
| count := 0 | ||
| for idx := 0; idx < s.BootlooseSuite.ControllerCount; idx++ { | ||
| if s.hasVIP(ctx, s.ControllerNode(idx), ipAddress) { | ||
| count++ | ||
| } | ||
| } | ||
| s.Require().Equal(1, count, "Expected only one controller to have the VIP") | ||
|
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| } | ||
|
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| // getLBAddress returns the IP address of the controller 0 and it adds 100 to | ||
| // the last octet unless it's bigger or equal to 154, in which case it | ||
| // subtracts 100. Theoretically this could result in an invalid IP address. | ||
| func (s *keepalivedSuite) getLBAddress() string { | ||
| ip := s.GetIPAddress(s.ControllerNode(0)) | ||
| parts := strings.Split(ip, ".") | ||
| if len(parts) != 4 { | ||
| s.T().Fatalf("Invalid IP address: %q", ip) | ||
| } | ||
| lastOctet, err := strconv.Atoi(parts[3]) | ||
| s.Require().NoErrorf(err, "Failed to convert last octet '%s' to int", parts[3]) | ||
| if lastOctet >= 154 { | ||
| lastOctet -= 100 | ||
| } else { | ||
| lastOctet += 100 | ||
| } | ||
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| return fmt.Sprintf("%s.%d", strings.Join(parts[:3], "."), lastOctet) | ||
| } | ||
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| // checkDummy checks that the dummy interface is present on the given node and | ||
| // that it has only the virtual IP address. | ||
| func (s *keepalivedSuite) checkDummy(ctx context.Context, node string, vip string) { | ||
| ssh, err := s.SSH(ctx, node) | ||
| s.Require().NoError(err) | ||
| defer ssh.Disconnect() | ||
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| output, err := ssh.ExecWithOutput(ctx, "ip --oneline addr show dummyvip0") | ||
| s.Require().NoError(err) | ||
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| s.Require().Equal(0, strings.Count(output, "\n"), "Expected only one line of output") | ||
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| expected := fmt.Sprintf("inet %s/32", vip) | ||
| s.Require().Contains(output, expected) | ||
| } | ||
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| // hasVIP checks that the dummy interface is present on the given node and | ||
| // that it has only the virtual IP address. | ||
| func (s *keepalivedSuite) hasVIP(ctx context.Context, node string, vip string) bool { | ||
| ssh, err := s.SSH(ctx, node) | ||
| s.Require().NoError(err) | ||
| defer ssh.Disconnect() | ||
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| output, err := ssh.ExecWithOutput(ctx, "ip --oneline addr show eth0") | ||
| s.Require().NoError(err) | ||
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| return strings.Contains(output, fmt.Sprintf("inet %s/24", vip)) | ||
| } | ||
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| // TestKeepAlivedSuite runs the keepalived test suite. It verifies that the | ||
| // virtual IP is working by joining a node to the cluster using the VIP. | ||
| func TestKeepAlivedSuite(t *testing.T) { | ||
| suite.Run(t, &keepalivedSuite{ | ||
| common.BootlooseSuite{ | ||
| ControllerCount: 3, | ||
| WorkerCount: 1, | ||
| }, | ||
| }) | ||
| } |
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