Updates to Alpine 3.21.0 (#49)

Signed-off-by: Adrian Cole <[email protected]>

Dockerfile

@@ -9,7 +9,7 @@
 # When updating, update the README and the alpine_version ARG
 #  * Use current version from https://alpinelinux.org/downloads/
 #  * ARGs repeat because Dockerfile ARGs are layer specific but will reuse the value defined here.
-ARG alpine_version=3.20.3
+ARG alpine_version=3.21.0
 
 # We copy files from the context into a scratch container first to avoid a problem where docker and
 # docker-compose don't share layer hashes https://github.com/docker/compose/issues/883 normally.
@@ -20,7 +20,7 @@ COPY . /code/
 
 # See from a previously published version to avoid pulling from Docker Hub (docker.io)
 # This version is only used to install the real version
-FROM ghcr.io/openzipkin/alpine:3.20.2 AS install
+FROM ghcr.io/openzipkin/alpine:3.20.3 AS install
 
 WORKDIR /code
 # Conditions aren't supported in Dockerfile instructions, so we copy source even if it isn't used.
@@ -56,7 +56,7 @@ RUN \
   # will throw UnknownHostException as the local hostname isn't in DNS.
   echo 'hosts: files mdns4_minimal [NOTFOUND=return] dns mdns4' >> /etc/nsswitch.conf && \
   #
-  # Exclusively use edge repos to get recent packages, but avoid conflicts with 3.20
+  # Exclusively use edge repos to get recent packages, but avoid conflicts with 3.21
   echo 'https://dl-cdn.alpinelinux.org/alpine/edge/main' > /etc/apk/repositories && \
   echo 'https://dl-cdn.alpinelinux.org/alpine/edge/testing' >> /etc/apk/repositories && \
   echo 'https://dl-cdn.alpinelinux.org/alpine/edge/community' >> /etc/apk/repositories && \
@@ -66,6 +66,6 @@ RUN \
   # * gcompat: BoringSSL for Netty per https://github.com/grpc/grpc-java/blob/master/SECURITY.md#netty
   apk add --no-cache java-cacerts ca-certificates gcompat && \
   # Typically, only amd64 is tested in CI: Run a command to ensure binaries match current arch.
-  ldd /lib/libz.so.1
+  ldd /usr/lib/libz.so.1
 
 ENTRYPOINT ["/bin/sh"]

README.md

@@ -13,22 +13,22 @@ This is an internal base layer primarily used in [docker-java](https://github.co
 
 To browse the image, run it in interactive mode with TTY enabled like so:
 ```bash
-docker run -ti --rm ghcr.io/openzipkin/alpine:3.20.3
+docker run -ti --rm ghcr.io/openzipkin/alpine:3.21.0
 / #
 ```
 
 ## Release process
 Build the `Dockerfile` using the current version from https://alpinelinux.org/downloads/:
 ```bash
-# Note 3.20.3 not 3.20!
-./build-bin/build 3.20.3
+# Note 3.21.0 not 3.21!
+./build-bin/build 3.21.0
 ```
 
 Next, verify the built image matches that version:
 ```bash
 docker run --rm openzipkin/alpine:test -c 'cat /etc/alpine-release'
-3.20.3
+3.21.0
 ```
 
-To release the image, push a tag matching the arg to `build-bin/build` (ex `3.20.3`).
+To release the image, push a tag matching the arg to `build-bin/build` (ex `3.21.0`).
 This triggers a [GitHub Actions](https://github.com/openzipkin/docker-alpine/actions) job to push the image.

build-bin/test

@@ -8,4 +8,4 @@ build-bin/build
 
 echo "Verifying Docker image..."
 # Invoke a binary in gcompat to ensure arch matches
-docker run --rm openzipkin/alpine:test -c 'ldd /lib/libz.so.1'
+docker run --rm openzipkin/alpine:test -c 'ldd /usr/lib/libz.so.1'