135 lines
3.1 KiB
Go
135 lines
3.1 KiB
Go
package save
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import (
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"flag"
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"fmt"
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"io"
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"os"
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"github.com/hashicorp/consul/api"
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"github.com/hashicorp/consul/command/flags"
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"github.com/hashicorp/consul/snapshot"
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"github.com/mitchellh/cli"
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)
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func New(ui cli.Ui) *cmd {
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c := &cmd{UI: ui}
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c.init()
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return c
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}
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type cmd struct {
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UI cli.Ui
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flags *flag.FlagSet
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http *flags.HTTPFlags
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usage string
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}
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func (c *cmd) init() {
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c.flags = flag.NewFlagSet("", flag.ContinueOnError)
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c.http = &flags.HTTPFlags{}
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flags.Merge(c.flags, c.http.ClientFlags())
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flags.Merge(c.flags, c.http.ServerFlags())
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c.usage = flags.Usage(usage, c.flags, c.http.ClientFlags(), c.http.ServerFlags())
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}
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func (c *cmd) Synopsis() string {
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return "Saves snapshot of Consul server state"
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}
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func (c *cmd) Help() string {
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return c.usage
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}
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func (c *cmd) Run(args []string) int {
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if err := c.flags.Parse(args); err != nil {
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return 1
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}
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var file string
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args = c.flags.Args()
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switch len(args) {
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case 0:
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c.UI.Error("Missing FILE argument")
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return 1
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case 1:
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file = args[0]
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default:
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c.UI.Error(fmt.Sprintf("Too many arguments (expected 1, got %d)", len(args)))
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return 1
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}
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// Create and test the HTTP client
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client, err := c.http.APIClient()
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error connecting to Consul agent: %s", err))
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return 1
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}
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// Take the snapshot.
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snap, qm, err := client.Snapshot().Save(&api.QueryOptions{
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AllowStale: c.http.Stale(),
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})
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error saving snapshot: %s", err))
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return 1
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}
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defer snap.Close()
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// Save the file.
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f, err := os.Create(file)
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error creating snapshot file: %s", err))
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return 1
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}
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if _, err := io.Copy(f, snap); err != nil {
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f.Close()
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c.UI.Error(fmt.Sprintf("Error writing snapshot file: %s", err))
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return 1
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}
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if err := f.Close(); err != nil {
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c.UI.Error(fmt.Sprintf("Error closing snapshot file after writing: %s", err))
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return 1
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}
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// Read it back to verify.
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f, err = os.Open(file)
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if err != nil {
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c.UI.Error(fmt.Sprintf("Error opening snapshot file for verify: %s", err))
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return 1
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}
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if _, err := snapshot.Verify(f); err != nil {
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f.Close()
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c.UI.Error(fmt.Sprintf("Error verifying snapshot file: %s", err))
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return 1
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}
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if err := f.Close(); err != nil {
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c.UI.Error(fmt.Sprintf("Error closing snapshot file after verify: %s", err))
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return 1
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}
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c.UI.Info(fmt.Sprintf("Saved and verified snapshot to index %d", qm.LastIndex))
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return 0
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}
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const usage = `Usage: consul snapshot save [options] FILE
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Retrieves an atomic, point-in-time snapshot of the state of the Consul servers
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which includes key/value entries, service catalog, prepared queries, sessions,
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and ACLs.
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If ACLs are enabled, a management token must be supplied in order to perform
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snapshot operations.
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To create a snapshot from the leader server and save it to "backup.snap":
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$ consul snapshot save backup.snap
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To create a potentially stale snapshot from any available server (useful if no
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leader is available):
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$ consul snapshot save -stale backup.snap
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For a full list of options and examples, please see the Consul documentation.`
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