60e9fe79af
Adds the following subcommands to the agnhost binary: - dns-server-list: outputs the host's DNS server list with which it was configured with. This can be found in /etc/resolv.conf on Linux and through some powershell commands on Windows. - etc-hosts: outputs the host's hosts file. This can be found in /etc/hosts for Linux, and C:/Windows/System32/drivers/etc/hosts for Windows. - pause: pauses the binary's execution. This can be used to keep the Pod in a Running state for various reasons, including executing additional agnhost commands. Refactors bits of the code to avoid duplication. Adds a README for the agnhost image.
56 lines
1.5 KiB
Go
56 lines
1.5 KiB
Go
// +build !windows
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/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package main
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import (
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"strings"
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)
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const etcHostsFile = "/etc/hosts"
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// A /etc/resolv.conf file managed by kubelet looks like this:
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// nameserver DNS_CLUSTER_IP
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// search test-dns.svc.cluster.local svc.cluster.local cluster.local q53aahaikqaehcai3ylfqdtc5b.bx.internal.cloudapp.net
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// options ndots:5
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func getDNSSuffixList() []string {
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fileData := readFile("/etc/resolv.conf")
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lines := strings.Split(fileData, "\n")
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for _, line := range lines {
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if strings.HasPrefix(line, "search") {
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// omit the starting "search".
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return strings.Split(line, " ")[1:]
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}
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}
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panic("Could not find DNS search list!")
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}
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func getDNSServerList() []string {
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fileData := readFile("/etc/resolv.conf")
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lines := strings.Split(fileData, "\n")
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for _, line := range lines {
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if strings.HasPrefix(line, "nameserver") {
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// omit the starting "nameserver".
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return strings.Split(line, " ")[1:]
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}
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}
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panic("Could not find DNS search list!")
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}
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