Compare large and small images

5 files changed, 55 insertions, 40 deletions

diff --git a/README.md b/README.md
index 5b91e18..11e64e3 100644
--- a/README.md
+++ b/README.md
@@ -107,29 +107,29 @@ curl -s -i https://registry-1.docker.io/v2/alpine/tags/list
 # Architecture
 
 ```text
-        ----------
-        | Client |
-        ----------
-        | build  |
-        | pull   |
-        | run    |
-        ----------
-            | (tcp/unix socket)
-            V
-      ---------------
-      | Docker Host |
-      ---------------
-      | Daemon     |
-      | Containers |
-      | Images     |
-      --------------
-            |  A
-            V  |
-       ------------
-       | Registry |
-       ------------
-       | Images   |
-       ------------
+                      ----------
+                      | Client |
+                      ----------
+                      | build  |
+                      | pull   |
+                      | run    |
+                      ----------
+                          | (tcp/unix socket)
+                          V
+                    ---------------
+                    | Docker Host |
+                    ---------------
+                    | Daemon     |
+                    | Containers |
+                    | Images     |
+                    --------------
+                          |  A
+                          V  |
+                    ------------
+                    | Registry |
+                    ------------
+                    | Images   |
+                    ------------
 ```
 
 https://docs.docker.com/get-started/overview/#docker-architecture
@@ -140,7 +140,7 @@ https://docs.docker.com/get-started/overview/#docker-architecture
 $ curl --unix-socket /var/run/docker.sock http://localhost/images/json
 ```
 
-```terminal16
+```terminal32
 curl -i --unix-socket /var/run/docker.sock http://localhost/images/json
 ```
 
@@ -154,13 +154,13 @@ docker version
 
 # $ docker image ls
 
-```terminal8
+```terminal32
 docker image ls --format "table {{.ID}}\t{{.Repository}}\t{{.Tag}}\t{{.Size}}"
 ```
 
 # $ docker ps
 
-```terminal8
+```terminal32
 docker ps --format "table {{.ID}}\t{{.Image}}\t{{.Status}}"
 ```
 
@@ -281,7 +281,7 @@ https://github.com/wagoodman/dive
 * Allows investigating files that are added/removed/changed in each layer
 
 ```terminal32
-bash examples/001/dive-exec.sh
+bash examples/001/dive-exec.sh developing-with-docker
 ```
 
 # Compression
@@ -289,7 +289,7 @@ bash examples/001/dive-exec.sh
 * More layers == more parallel downloads
 * Smaller layers == faster downloads per layer
 
-```terminal16
+```terminal32
 bash -i examples/001/docker-large-download.sh
 ```
 
@@ -307,7 +307,7 @@ docker build -t big-image:latest examples/002/
 
 # docker image ls
 
-```terminal8
+```terminal32
 docker image ls --format "table {{.ID}}\t{{.Repository}}\t{{.Tag}}\t{{.Size}}"
 ```
 
@@ -334,16 +334,29 @@ lang: sh
 docker build -t small-image:latest examples/003/
 ```
 
+# dive small-image:latest
+
+```terminal32
+bash examples/001/dive-exec.sh small-image
+```
+
+# docker run -it small-image:latest
+
+```terminal32
+docker run -it small-image:latest
+```
+
 # docker image ls
 
-```terminal8
-docker image ls --format "table {{.ID}}\t{{.Repository}}\t{{.Tag}}\t{{.Size}}"
+```terminal32
+docker image ls --format "table {{.ID}}\t{{.Tag}}\t{{.Size}}"
 ```
 
+
 # Summary
 
 * Keep each layer small
-* More layers means more parallel downloads
+* More layers provides opportunity for more parallel downloads
 
 # Fin
 
diff --git a/examples/001/dive-exec.sh b/examples/001/dive-exec.sh
index a14c43d..68de99d 100644
--- a/examples/001/dive-exec.sh
+++ b/examples/001/dive-exec.sh
@@ -1,6 +1,8 @@
 #!/bin/sh
 
 set -e
-image_id="$(docker image ls developing-with-docker | awk '{ print $3 }' | grep -v REPO | tail -n1)"
+
+name="$1"
+image_id="$(docker image ls "$name" | awk '{ print $3 }' | grep -v REPO | tail -n1)"
 echo "$ dive $image_id"
 dive "$image_id"
diff --git a/examples/002/Dockerfile b/examples/002/Dockerfile
index f875871..304abfb 100644
--- a/examples/002/Dockerfile
+++ b/examples/002/Dockerfile
@@ -5,4 +5,3 @@ RUN apt-get install -y git
 RUN apt-get install -y ruby
 RUN apt-get install -y zstd
 RUN git clone --verbose https://github.com/spandx/cache.git /opt/db
-WORKDIR /opt
diff --git a/examples/003/Dockerfile b/examples/003/Dockerfile
index 35b83ea..a722743 100644
--- a/examples/003/Dockerfile
+++ b/examples/003/Dockerfile
@@ -1,8 +1,9 @@
 FROM debian:stable-slim
 ENV PACKAGES git ruby zstd
-RUN apt-get update -y --no-install-recommends $PACKAGES \
+RUN apt-get update -y \
+  && apt-get install -y --no-install-recommends $PACKAGES \
   && git clone https://github.com/spandx/cache.git /opt/db \
   && tar --use-compress-program zstd -cf /opt/db.tar.zst /opt/db \
   && rm -fr /opt/db
 COPY run.sh /run.sh
-CMD ['/run.sh']
+ENTRYPOINT ["/run.sh"]
diff --git a/examples/003/run.sh b/examples/003/run.sh
index db1f294..bf50deb 100644
--- a/examples/003/run.sh
+++ b/examples/003/run.sh
@@ -1,8 +1,8 @@
 #!/bin/sh
 
-set -ex
+set -e
 
+echo "[$(date +s)] Inflating /opt/db.tar.zst"
 tar -xf /opt/db.tar.zst
-
-cd /opt/db/.index
-sh
+echo sh "$@"
+sh "$@"