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Add Prometheus Node Exporter as a system install
Signed-off-by: Alex Ellis (OpenFaaS Ltd) <[email protected]>
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,131 @@ | ||
| // Copyright (c) arkade author(s) 2024. All rights reserved. | ||
| // Licensed under the MIT license. See LICENSE file in the project root for full license information. | ||
|
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| package system | ||
|
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||
| import ( | ||
| "context" | ||
| "fmt" | ||
| "os" | ||
| "strings" | ||
|
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| "github.com/alexellis/arkade/pkg/env" | ||
| "github.com/alexellis/arkade/pkg/get" | ||
| "github.com/spf13/cobra" | ||
| ) | ||
|
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| func MakeInstallNodeExporter() *cobra.Command { | ||
| command := &cobra.Command{ | ||
| Use: "node_exporter", | ||
| Short: "Install Node Exporter", | ||
| Long: `Install Node Exporter which is a Prometheus exporter for hardware and OS | ||
| metrics exposed by a server/container such as CPU/RAM/Disk/Network.`, | ||
| RunE: installNodeExporterE, | ||
| SilenceUsage: true, | ||
| } | ||
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| command.Flags().StringP("version", "v", "", "The version for Go, or leave blank for pinned version") | ||
| command.Flags().String("path", "/usr/local/", "Installation path, where a go subfolder will be created") | ||
| command.Flags().Bool("progress", true, "Show download progress") | ||
| command.Flags().Bool("systemd", false, "Install and start a systemd service") | ||
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| return command | ||
| } | ||
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| func installNodeExporterE(cmd *cobra.Command, args []string) error { | ||
| installPath, _ := cmd.Flags().GetString("path") | ||
| version, _ := cmd.Flags().GetString("version") | ||
| progress, _ := cmd.Flags().GetBool("progress") | ||
| systemd, _ := cmd.Flags().GetBool("systemd") | ||
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| arch, osVer := env.GetClientArch() | ||
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| if cmd.Flags().Changed("os") { | ||
| osVer, _ = cmd.Flags().GetString("os") | ||
| } | ||
| if cmd.Flags().Changed("arch") { | ||
| arch, _ = cmd.Flags().GetString("arch") | ||
| } | ||
|
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| if strings.ToLower(osVer) != "linux" && strings.ToLower(osVer) != "darwin" { | ||
| return fmt.Errorf("this app only supports Linux and Darwin") | ||
| } | ||
|
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| tools := get.MakeTools() | ||
| var tool *get.Tool | ||
| for _, t := range tools { | ||
| if t.Name == "node_exporter" { | ||
| tool = &t | ||
| break | ||
| } | ||
| } | ||
|
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| if tool == nil { | ||
| return fmt.Errorf("unable to find node_exporter definition") | ||
| } | ||
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| fmt.Printf("Installing node_exporter Server to %s\n", installPath) | ||
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| installPath = strings.ReplaceAll(installPath, "$HOME", os.Getenv("HOME")) | ||
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| if err := os.MkdirAll(installPath, 0755); err != nil && !os.IsExist(err) { | ||
| fmt.Printf("Error creating directory %s, error: %s\n", installPath, err.Error()) | ||
| } | ||
|
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| if version == "" { | ||
| v, err := get.FindGitHubRelease("prometheus", "node_exporter") | ||
| if err != nil { | ||
| return err | ||
| } | ||
| version = v | ||
| } else if !strings.HasPrefix(version, "v") { | ||
| version = "v" + version | ||
| } | ||
|
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| outFilePath, _, err := get.Download(tool, arch, osVer, version, installPath, progress, !progress) | ||
| if err != nil { | ||
| return err | ||
| } | ||
| if err = os.Chmod(outFilePath, readWriteExecuteEveryone); err != nil { | ||
| return err | ||
| } | ||
|
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| if systemd && strings.ToLower(osVer) != "linux" { | ||
| return fmt.Errorf("systemd is only supported on Linux") | ||
| } | ||
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| if systemd { | ||
| systemdUnit := generateUnit(outFilePath) | ||
| unitName := "/etc/systemd/system/node_exporter.service" | ||
| if err := os.WriteFile(unitName, []byte(systemdUnit), readWriteExecuteEveryone); err != nil { | ||
| return err | ||
| } | ||
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| fmt.Printf("Wrote: %s\n", systemdUnit) | ||
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| if _, err = executeShellCmd(context.Background(), "systemctl", "daemon-reload"); err != nil { | ||
| return err | ||
| } | ||
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| if _, err = executeShellCmd(context.Background(), "systemctl", "enable", "node_exporter", "--now"); err != nil { | ||
| return err | ||
| } | ||
|
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| fmt.Printf("Started node_exporter\n") | ||
|
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| } | ||
| return nil | ||
| } | ||
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| func generateUnit(outFilePath string) string { | ||
| return fmt.Sprintf(`[Unit] | ||
| Description=Node Exporter | ||
| After=network.target | ||
| [Service] | ||
| ExecStart=%s/node_exporter | ||
| [Install] | ||
| WantedBy=multi-user.target | ||
| `, outFilePath) | ||
| } |
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