specify persistent volume when creating postgres container

Author: maxdml

cmd/dbos/postgres.go

@@ -11,16 +11,18 @@ import (
 
 	"github.com/docker/docker/api/types/container"
 	"github.com/docker/docker/api/types/image"
+	"github.com/docker/docker/api/types/volume"
 	"github.com/docker/docker/client"
 	"github.com/docker/go-connections/nat"
 	_ "github.com/jackc/pgx/v5/stdlib"
 	"github.com/spf13/cobra"
 )
 
 const (
-	containerName = "dbos-db"
-	imageName     = "pgvector/pgvector:pg16"
-	pgData        = "/var/lib/postgresql/data"
+	containerName        = "dbos-db"
+	imageName            = "pgvector/pgvector:pg16"
+	pgData               = "/var/lib/postgresql/data"
+	hostPgDataVolumeName = "pgdata"
 )
 
 var postgresCmd = &cobra.Command{
@@ -147,6 +149,10 @@ func startDockerPostgres() error {
 		},
 	}
 
+	_, err = cli.VolumeCreate(ctx, volume.CreateOptions{Name: hostPgDataVolumeName})
+	if err != nil {
+		return fmt.Errorf("failed to create volume %s for Postgres: %w", hostPgDataVolumeName, err)
+	}
 	hostConfig := &container.HostConfig{
 		PortBindings: nat.PortMap{
 			"5432/tcp": []nat.PortBinding{
@@ -157,6 +163,9 @@ func startDockerPostgres() error {
 			},
 		},
 		AutoRemove: true,
+		Binds: []string{
+			fmt.Sprintf("%s:%s", hostPgDataVolumeName, pgData),
+		},
 	}
 
 	resp, err := cli.ContainerCreate(ctx, config, hostConfig, nil, nil, containerName)