Merge pull request #36 from djmaze/docker-graph-caching
Docker graph caching
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commit
17b6c14342
30
DOCS.md
30
DOCS.md
@ -78,9 +78,35 @@ publish:
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- HTTP_PROXY=http://yourproxy.com
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- HTTP_PROXY=http://yourproxy.com
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```
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```
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## Layer Caching
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## Caching
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The Drone build environment is, by default, ephemeral meaning that you layers are not saved between builds. The below example combines Drone's caching feature and Docker's `save` and `load` capabilities to cache and restore image layers between builds:
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The Drone build environment is, by default, ephemeral meaning that you layers are not saved between builds. There are two methods for caching your layers.
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### Graph directory caching
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This is the preferred method when using the `overlay` or `aufs` storage drivers. Just use Drone's caching feature to backup and restore the directory `/drone/docker`, as shown in the following example:
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```yaml
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publish:
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docker:
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username: kevinbacon
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password: pa55word
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email: kevin.bacon@mail.com
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repo: foo/bar
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tag:
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- latest
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- "1.0.1"
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cache:
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mount:
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- /drone/docker
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```
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NOTE: This probably won't work correctly with the `btrfs` driver, and it will be very inefficient with the `devicemapper` driver. Please make sure to use the `overlay` or `aufs` storage driver with this method.
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### Layer Caching
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The below example combines Drone's caching feature and Docker's `save` and `load` capabilities to cache and restore image layers between builds:
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```yaml
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```yaml
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publish:
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publish:
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26
main.go
26
main.go
@ -1,6 +1,7 @@
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package main
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package main
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import (
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import (
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"bytes"
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"fmt"
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"fmt"
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"io/ioutil"
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"io/ioutil"
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"os"
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"os"
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@ -93,7 +94,7 @@ func main() {
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}
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}
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go func() {
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go func() {
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args := []string{"daemon"}
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args := []string{"daemon", "-g", "/drone/docker"}
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if len(vargs.Storage) != 0 {
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if len(vargs.Storage) != 0 {
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args = append(args, "-s", vargs.Storage)
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args = append(args, "-s", vargs.Storage)
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@ -228,6 +229,29 @@ func main() {
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}
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}
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}
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}
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// Remove untagged images, if any
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var outbuf bytes.Buffer
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cmd = exec.Command("docker", "images", "-q", "-f", "dangling=true")
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cmd.Stdout = &outbuf
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cmd.Stderr = os.Stderr
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trace(cmd)
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err = cmd.Run()
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if err != nil {
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os.Exit(1)
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}
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if outbuf.Len() > 0 {
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images := strings.Split(strings.TrimSpace(outbuf.String()), "\n")
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cmd = exec.Command("docker", append([]string{"rmi"}, images...)...)
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cmd.Stdout = os.Stdout
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cmd.Stderr = os.Stderr
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trace(cmd)
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err := cmd.Run()
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if err != nil {
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os.Exit(1)
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}
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}
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// Save to tarred image repository
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// Save to tarred image repository
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if len(vargs.Save.File) != 0 {
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if len(vargs.Save.File) != 0 {
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// if the destination directory does not exist, create it
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// if the destination directory does not exist, create it
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