From a4df9f4ab147e66c96fd791fb52d3a93787f291c Mon Sep 17 00:00:00 2001 From: Erik Wilson Date: Tue, 26 Mar 2019 22:15:16 +0000 Subject: [PATCH 1/2] Kubelet resolv.conf DNS update Allow the kubelet resolv-conf flag to be set, or automatically discovered from /etc/resolv.conf & /run/systemd/resolve/resolv.conf if no loopback devices are present, or create our own which points to nameserver 8.8.8.8 --- manifests/coredns.yaml | 2 +- pkg/agent/config/config.go | 47 +++++++++++++++++++++++++++++++++++++ pkg/cli/cmds/agent.go | 8 +++++++ pkg/cli/cmds/server.go | 1 + pkg/daemons/agent/agent.go | 3 +++ pkg/daemons/config/types.go | 1 + 6 files changed, 61 insertions(+), 1 deletion(-) diff --git a/manifests/coredns.yaml b/manifests/coredns.yaml index 3b074027dc..23b7f0474d 100644 --- a/manifests/coredns.yaml +++ b/manifests/coredns.yaml @@ -61,7 +61,7 @@ data: fallthrough in-addr.arpa ip6.arpa } prometheus :9153 - proxy . 1.1.1.1 + proxy . /etc/resolv.conf cache 30 loop reload diff --git a/pkg/agent/config/config.go b/pkg/agent/config/config.go index cee04aa8ed..9a5a16232f 100644 --- a/pkg/agent/config/config.go +++ b/pkg/agent/config/config.go @@ -1,15 +1,18 @@ package config import ( + "bufio" "context" "crypto/tls" "encoding/pem" "fmt" "io/ioutil" + sysnet "net" "net/url" "os" "os/exec" "path/filepath" + "regexp" "strings" "time" @@ -115,6 +118,49 @@ func writeKubeConfig(envInfo *cmds.Agent, info clientaccess.Info, controlConfig return kubeConfigPath, info.WriteKubeConfig(kubeConfigPath) } +func isValidResolvConf(resolvConfFile string) bool { + file, err := os.Open(resolvConfFile) + if err != nil { + return false + } + defer file.Close() + + nameserver := regexp.MustCompile(`^nameserver\s+([^\s]*)`) + scanner := bufio.NewScanner(file) + for scanner.Scan() { + ipMatch := nameserver.FindStringSubmatch(scanner.Text()) + if len(ipMatch) == 2 { + ip := sysnet.ParseIP(ipMatch[1]) + if ip == nil || !ip.IsGlobalUnicast() { + return false + } + } + } + if err := scanner.Err(); err != nil { + return false + } + return true +} + +func locateOrGenerateResolvConf(envInfo *cmds.Agent) string { + if envInfo.ResolvConf != "" { + return envInfo.ResolvConf + } + resolvConfs := []string{"/etc/resolv.conf", "/run/systemd/resolve/resolv.conf"} + for _, conf := range resolvConfs { + if isValidResolvConf(conf) { + return conf + } + } + + tmpConf := filepath.Join(os.TempDir(), "k3s-resolv.conf") + if err := ioutil.WriteFile(tmpConf, []byte("nameserver 8.8.8.8\n"), 0444); err != nil { + logrus.Error(err) + return "" + } + return tmpConf +} + func get(envInfo *cmds.Agent) (*config.Node, error) { if envInfo.Debug { logrus.SetLevel(logrus.DebugLevel) @@ -170,6 +216,7 @@ func get(envInfo *cmds.Agent) (*config.Node, error) { nodeConfig.AgentConfig.NodeIP = nodeIP nodeConfig.AgentConfig.NodeName = nodeName nodeConfig.AgentConfig.ClusterDNS = controlConfig.ClusterDNS + nodeConfig.AgentConfig.ResolvConf = locateOrGenerateResolvConf(envInfo) nodeConfig.AgentConfig.CACertPath = clientCA nodeConfig.AgentConfig.ListenAddress = "127.0.0.1" nodeConfig.AgentConfig.KubeConfig = kubeConfig diff --git a/pkg/cli/cmds/agent.go b/pkg/cli/cmds/agent.go index ebfd5dfbca..1c1f11e56d 100644 --- a/pkg/cli/cmds/agent.go +++ b/pkg/cli/cmds/agent.go @@ -11,6 +11,7 @@ type Agent struct { Token string TokenFile string ServerURL string + ResolvConf string DataDir string NodeIP string NodeName string @@ -55,6 +56,12 @@ var ( Usage: "(agent) Disable embedded containerd and use alternative CRI implementation", Destination: &AgentConfig.ContainerRuntimeEndpoint, } + ResolvConfFlag = cli.StringFlag{ + Name: "resolv-conf", + Usage: "Kubelet resolv.conf file", + EnvVar: "K3S_RESOLV_CONF", + Destination: &AgentConfig.ResolvConf, + } ) func NewAgentCommand(action func(ctx *cli.Context) error) cli.Command { @@ -99,6 +106,7 @@ func NewAgentCommand(action func(ctx *cli.Context) error) cli.Command { NodeNameFlag, NodeIPFlag, CRIEndpointFlag, + ResolvConfFlag, }, } } diff --git a/pkg/cli/cmds/server.go b/pkg/cli/cmds/server.go index eeb4de522e..fc860e81bd 100644 --- a/pkg/cli/cmds/server.go +++ b/pkg/cli/cmds/server.go @@ -105,6 +105,7 @@ func NewServerCommand(action func(*cli.Context) error) cli.Command { DockerFlag, FlannelFlag, CRIEndpointFlag, + ResolvConfFlag, }, } } diff --git a/pkg/daemons/agent/agent.go b/pkg/daemons/agent/agent.go index 86c89f3a2b..3c9be58dcb 100644 --- a/pkg/daemons/agent/agent.go +++ b/pkg/daemons/agent/agent.go @@ -76,6 +76,9 @@ func kubelet(cfg *config.Agent) { if len(cfg.ClusterDNS) > 0 { args = append(args, "--cluster-dns", cfg.ClusterDNS.String()) } + if cfg.ResolvConf != "" { + args = append(args, "--resolv-conf", cfg.ResolvConf) + } if cfg.RuntimeSocket != "" { args = append(args, "--container-runtime", "remote") args = append(args, "--container-runtime-endpoint", cfg.RuntimeSocket) diff --git a/pkg/daemons/config/types.go b/pkg/daemons/config/types.go index 78a6a0f5a3..26cd4ccec2 100644 --- a/pkg/daemons/config/types.go +++ b/pkg/daemons/config/types.go @@ -36,6 +36,7 @@ type Agent struct { NodeName string ClusterCIDR net.IPNet ClusterDNS net.IP + ResolvConf string RootDir string KubeConfig string NodeIP string From bb14bcb5956edfd231ac98766d68a75046607e8c Mon Sep 17 00:00:00 2001 From: Erik Wilson Date: Tue, 26 Mar 2019 22:27:42 +0000 Subject: [PATCH 2/2] Update generated data --- pkg/deploy/zz_generated_bindata.go | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/pkg/deploy/zz_generated_bindata.go b/pkg/deploy/zz_generated_bindata.go index 6676603978..672f409640 100644 --- a/pkg/deploy/zz_generated_bindata.go +++ b/pkg/deploy/zz_generated_bindata.go @@ -69,7 +69,7 @@ func (fi bindataFileInfo) Sys() interface{} { return nil } -var _corednsYaml = 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+var _corednsYaml = 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func corednsYamlBytes() ([]byte, error) { return bindataRead(