entry point script migration to golang #1726
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| // Copyright Amazon.com Inc. or its affiliates. All Rights Reserved. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"). You may | ||
| // not use this file except in compliance with the License. A copy of the | ||
| // License is located at | ||
| // | ||
| // http://aws.amazon.com/apache2.0/ | ||
| // | ||
| // or in the "license" file accompanying this file. This file 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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| // The aws-node initialization | ||
| package main | ||
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| import ( | ||
| "os" | ||
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| "github.com/aws/amazon-vpc-cni-k8s/utils/cp" | ||
| "github.com/aws/amazon-vpc-cni-k8s/utils/imds" | ||
| "github.com/aws/amazon-vpc-cni-k8s/utils/sysctl" | ||
| log "github.com/sirupsen/logrus" | ||
| "github.com/vishvananda/netlink" | ||
| ) | ||
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||
| const ( | ||
| defaultHostCNIBinPath = "/host/opt/cni/bin" | ||
| metadataLocalIP = "local-ipv4" | ||
| metadataMAC = "mac" | ||
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| envDisableIPv4TcpEarlyDemux = "DISABLE_TCP_EARLY_DEMUX" | ||
| envEnableIPv6 = "ENABLE_IPv6" | ||
| envHostCniBinPath = "HOST_CNI_BIN_PATH" | ||
| ) | ||
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| func getEnv(env, def string) string { | ||
| if val, ok := os.LookupEnv(env); ok { | ||
| return val | ||
| } | ||
| return def | ||
| } | ||
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| func main() { | ||
| os.Exit(_main()) | ||
| } | ||
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| func _main() int { | ||
| log.Debug("Started Initialization") | ||
| pluginBins := []string{"loopback", "portmap", "bandwidth", "aws-cni-support.sh"} | ||
| var err error | ||
| for _, plugin := range pluginBins { | ||
| if _, err = os.Stat(plugin); err != nil { | ||
| log.WithError(err).Fatalf("Required executable : %s not found\n", plugin) | ||
| return 1 | ||
| } | ||
| } | ||
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| hostCNIBinPath := getEnv(envHostCniBinPath, defaultHostCNIBinPath) | ||
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| log.Infof("Copying CNI plugin binaries ...") | ||
| err = cp.InstallBinaries(pluginBins, hostCNIBinPath) | ||
| if err != nil { | ||
| log.WithError(err).Errorf("Failed to install binaries") | ||
| return 1 | ||
| } | ||
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| log.Infof("Copied all CNI plugin binaries to %s\n", hostCNIBinPath) | ||
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| var hostIP string | ||
| hostIP, err = imds.GetMetaData("local-ipv4") | ||
| if err != nil { | ||
| log.WithError(err).Fatalf("aws-vpc-cni init failed\n") | ||
| return 1 | ||
| } | ||
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| var primaryMAC string | ||
| primaryMAC, err = imds.GetMetaData("mac") | ||
| if err != nil { | ||
| log.WithError(err).Fatalf("aws-vpc-cni init failed\n") | ||
| return 1 | ||
| } | ||
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| log.Infof("Found hostIP %s and primaryMAC %s", hostIP, primaryMAC) | ||
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| links, err := netlink.LinkList() | ||
| if err != nil { | ||
| log.WithError(err).Fatalf("Failed to list links\n") | ||
| return 1 | ||
| } | ||
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| var primaryIF string | ||
| for _, link := range links { | ||
| if link.Attrs().HardwareAddr.String() == primaryMAC { | ||
| primaryIF = link.Attrs().Name | ||
| break | ||
| } | ||
| } | ||
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| if primaryIF == "" { | ||
| log.Errorf("Failed to retrieve primary IF") | ||
| return 1 | ||
| } | ||
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| log.Infof("Found primaryIF %s", primaryIF) | ||
| sys := sysctl.New() | ||
| entry := "net/ipv4/conf/" + primaryIF + "/rp_filter" | ||
| err = sys.SetSysctl(entry, 2) | ||
| if err != nil { | ||
| log.WithError(err).Fatalf("Failed to set rp_filter for %s\n", primaryIF) | ||
| return 1 | ||
| } | ||
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| val, _ := sys.GetSysctl(entry) | ||
| log.Infof("Updated entry for %d", val) | ||
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| disableIPv4EarlyDemux := getEnv(envDisableIPv4TcpEarlyDemux, "false") | ||
| entry = "net/ipv4/tcp_early_demux" | ||
| if disableIPv4EarlyDemux == "true" { | ||
| err = sys.SetSysctl(entry, 0) | ||
| if err != nil { | ||
| log.WithError(err).Fatalf("Failed to disable tcp_early_demux\n") | ||
| return 1 | ||
| } | ||
| } else { | ||
| err = sys.SetSysctl(entry, 1) | ||
| if err != nil { | ||
| log.WithError(err).Fatalf("Failed to enable tcp_early_demux\n") | ||
| return 1 | ||
| } | ||
| } | ||
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| val, _ = sys.GetSysctl(entry) | ||
| log.Infof("Updated entry for %d", val) | ||
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| enableIPv6 := getEnv(envEnableIPv6, "false") | ||
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| if enableIPv6 == "true" { | ||
| entry = "net/ipv6/conf/all/disable_ipv6" | ||
| err = sys.SetSysctl(entry, 0) | ||
| if err != nil { | ||
| log.WithError(err).Fatalf("Failed to enable disable_ipv6\n") | ||
|
There was a problem hiding this comment. nit: maybe "Failed to set There was a problem hiding this comment. Yeah I can add it. |
||
| return 1 | ||
| } | ||
| val, _ = sys.GetSysctl(entry) | ||
| log.Infof("Updated entry for %d", val) | ||
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| entry = "net/ipv6/conf/all/forwarding" | ||
| err = sys.SetSysctl(entry, 1) | ||
| if err != nil { | ||
| log.WithError(err).Fatalf("Failed to enable ipv6 forwarding\n") | ||
| return 1 | ||
| } | ||
| val, _ = sys.GetSysctl(entry) | ||
| log.Infof("Updated entry for %d", val) | ||
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| entry = "net/ipv6/conf/" + primaryIF + "/accept_ra" | ||
| err = sys.SetSysctl(entry, 2) | ||
| if err != nil { | ||
| log.WithError(err).Fatalf("Failed to enable ipv6 accept_ra\n") | ||
| return 1 | ||
| } | ||
| val, _ = sys.GetSysctl(entry) | ||
| log.Infof("Updated entry for %d", val) | ||
| } | ||
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| log.Infof("CNI init container done") | ||
| return 0 | ||
| } | ||
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If the environment variable is not present, then we would be leaving default IPv6 settings. Should this explicitly disable IPv6 when env var is not present?
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Yes false is the default.
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But that default could change on AL2. I think we should call these sysctls either way to be safe