"gocage migrate jail -d destination_dataset" working for cold migrations
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fb3ee07585
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183
cmd/migrate.go
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183
cmd/migrate.go
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package cmd
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import (
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// "os"
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"fmt"
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"strings"
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/* "bufio"
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"errors"
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"regexp"
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"time"
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*/
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)
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const (
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// 1MB
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BUFFER_SIZE = 512
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)
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/********************************************************************************
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* Migrate jail to another zfs pool
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*******************************************************************************/
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func MigrateJail(args []string) {
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var jailNames []string
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var cj *Jail
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if len(args) > 0 {
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for _, a := range args {
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jailNames = append(jailNames, a)
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}
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}
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for _, jn := range jailNames {
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cmd := fmt.Sprintf("zfs list %s/iocage/jails", gMigrateDestPool)
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out, err := executeCommand(cmd)
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if err != nil {
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fmt.Printf("Error executing command %s: %v; command returned: %s\n", cmd, err, out)
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return
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}
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//cj, err := getJailFromArray(jn, gJails)
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for i, j := range gJails {
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if strings.EqualFold(j.Name, jn) {
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cj = &gJails[i]
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break
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}
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}
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if cj == nil {
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fmt.Printf("Error getting jail %s: Not found\n", jn)
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return
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}
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/* TODO : Check dest pool (gMigrateDestPool) existence
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zfs snapshot /iocage/jails/$jail@gocage_mig_first_snap
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zfs snapshot /iocage/jails/$jail/root@gocage_mig_first_snap
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zfs send jail@gocage_mig_first_snap | zfs receive destpool/jails/jail_name
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zfs send jail/root@@gocage_mig_first_snap | zfs receive destpool/jails/jail_name/root
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shutdown jail if needed
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if jail was shutdown
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zfs snapshot /iocage/jails/$jail@gocage_mig_last_snap to get last data
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zfs send jail/root@gocage_mig_last_snap | zfs receive -F destpool/jails/jail_name
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start jail on new dest
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zfs destroy destpool/jails/jail_name@gocage_mig_first_snap
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zfs destroy destpool/jails/jail_name/root@gocage_mig_first_snap
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*/
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// Snapshot config
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dsconf := strings.Join([]string{cj.Zpool, "iocage", "jails", jn}, "/")
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fmt.Printf("Snapshot %s: ", dsconf)
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if err = zfsSnapshot(dsconf, "gocage_mig_init"); err != nil {
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fmt.Printf("Error: %v\n", err)
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return
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}
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fmt.Printf("Done\n")
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// Snapshot filesystem
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dsdata := strings.Join([]string{cj.Zpool, "iocage", "jails", jn, "root"}, "/")
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fmt.Printf("Snapshot %s: ", dsdata)
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if err := zfsSnapshot(dsdata, "gocage_mig_init"); err != nil {
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fmt.Printf("Error: %v\n", err)
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return
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}
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fmt.Printf("Done\n")
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dsconfdest := strings.Join([]string{gMigrateDestPool, "iocage", "jails", jn}, "/")
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fmt.Printf("Migrate jail config dataset to %s: ", dsconfdest)
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if err := zfsCopy(fmt.Sprintf("%s@gocage_mig_init", dsconf), dsconfdest); err != nil {
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fmt.Printf("Error: %v\n", err)
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}
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fmt.Printf("Done\n")
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/* // First, declare sending process & pipe
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cmd_send = exec.Command("zfs", "send", fmt.Sprintf("%s@gocage_mig_init", strings.Join([]string{cj.Zpool, "iocage", "jails", jn, "root"}, "/")))
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stdout_send, err = cmd_send.StdoutPipe()
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if err != nil {
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fmt.Printf("Error executing command \"zfs send %s\": %v\n", fmt.Sprintf("%s@gocage_mig_init", strings.Join([]string{cj.Zpool, "iocage", "jails", jn, "root"}, "/")), err)
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return
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}
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// then declare receiving process & pipe
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cmd_recv = exec.Command("zfs", "receive", strings.Join([]string{gMigrateDestPool, "iocage", "jails", jn, "root"}, "/"))
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stdin_recv, err = cmd_recv.StdinPipe()
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if err != nil {
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fmt.Printf("Error executing command \"zfs receive %s\": %v\n", strings.Join([]string{gMigrateDestPool, "iocage", "jails", jn, "root"}, "/"), err)
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return
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}
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// Copy data in a go routine
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go io.Copy(stdin_recv, stdout_send)
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// then start processes and wait for finish
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fmt.Printf("DEBUG: Start \"zfs receive %s\"\n", strings.Join([]string{gMigrateDestPool, "iocage", "jails", jn, "root"}, "/"))
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if err := cmd_recv.Start(); err != nil {
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fmt.Printf("Error starting zfs recv: %v\n", err)
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return
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}
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fmt.Printf("DEBUG: Start \"zfs send %s\"\n", fmt.Sprintf("%s@gocage_mig_init", strings.Join([]string{cj.Zpool, "iocage", "jails", jn, "root"}, "/")))
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if err := cmd_send.Start(); err != nil {
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fmt.Printf("Error starting zfs send: %v\n", err)
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return
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}
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fmt.Printf("DEBUG: Wait for zfs send to finish\n")
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if err := cmd_send.Wait(); err != nil {
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fmt.Printf("Error: zfs send halted with %s\n", err)
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return
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}
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fmt.Printf("DEBUG: Wait for zfs recv to finish\n")
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if err := cmd_recv.Wait(); err != nil {
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fmt.Printf("Error: zfs recv halted with %s\n", err)
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return
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}
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*/
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dsdatadest := strings.Join([]string{gMigrateDestPool, "iocage", "jails", jn, "root"}, "/")
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fmt.Printf("Migrate jail filesystem dataset to %s: ", dsdatadest)
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if err := zfsCopy(fmt.Sprintf("%s@gocage_mig_init", dsdata), dsdatadest); err != nil {
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fmt.Printf("Error: %v\n", err)
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}
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fmt.Printf("Done\n")
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}
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}
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// Clean snapshots from an aborted migration
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func CleanMigrateMess(args []string) {
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var jailNames []string
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var cj *Jail
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if len(args) > 0 {
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for _, a := range args {
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jailNames = append(jailNames, a)
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}
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}
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for _, jn := range jailNames {
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for i, j := range gJails {
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if strings.EqualFold(j.Name, jn) {
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cj = &gJails[i]
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break
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}
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}
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if cj == nil {
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fmt.Printf("Error getting jail %s: Not found\n", jn)
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return
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}
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cmd := fmt.Sprintf("zfs destroy %s@gocage_mig_init", strings.Join([]string{cj.Zpool, "iocage", "jails", jn}, "/"))
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out, err := executeCommand(cmd)
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if err != nil {
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if false == strings.EqualFold(out, "could not find any snapshots to destroy; check snapshot names.") {
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fmt.Printf("Error executing command %s: %v; command returned: %s\n", cmd, err, out)
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return
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}
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}
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cmd = fmt.Sprintf("zfs destroy %s@gocage_mig_init", strings.Join([]string{cj.Zpool, "iocage", "jails", jn, "root"}, "/"))
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out, err = executeCommand(cmd)
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if err != nil {
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if false == strings.EqualFold(out, "could not find any snapshots to destroy; check snapshot names.") {
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fmt.Printf("Error executing command %s: %v; command returned: %s\n", cmd, err, out)
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return
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}
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}
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}
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}
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