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--- wiki:docker_troubleshooting [2023/09/15 13:02] – add failed to compute cache key antisa
+++ wiki:docker_troubleshooting [2025/04/10 12:25] (current) – [Containers lose access to internet suddenly] update docker version antisa
@@ Line 85: / Line 85: @@
 =====   stderr: 'failed to solve: failed to compute cache key: failed to calculate checksum ... no such file or directory' =====
-Make sure that the files (app files, folders etc.) that the Dockerfile is suppose to copy are in the project root directory, where the Dockerfile file is (or docker compose file).
+Make sure that the files (app files, folders etc.) that the Dockerfile is suppose to copy are in the project root directory, where the Dockerfile file is (or docker compose file). Also check ''.dockerignore''
+===== No internet access when building an image =====
+In an alpine image this might manifest for example (run inside the virtualbox VM) :
+<code>
+fatal: [10.21.21.11]: FAILED! => changed=false
+  msg: 'Error building my/container - code: 2, message: The command ''/bin/sh -c apk add --no-cache libc6-compat git'' returned a non-zero code: 2, logs: [''Step 1/31 : FROM node:18.18.2-alpine AS deps''
+, ''\n'', '' ---> 1646380c3156\n'', ''Step 2/31 : RUN apk add --no-cache libc6-compat git'', ''\n'', '' ---> Running in 567cff6b368f\n'', ''fetch https://dl-cdn.alpinelinux.org/alpine/v3.18/main/x86_64/APKINDEX.
+tar.gz\n'', ''fetch https://dl-cdn.alpinelinux.org/alpine/v3.18/community/x86_64/APKINDEX.tar.gz\n'', ''\x1b[91mWARNING: fetching https://dl-cdn.alpinelinux.org/alpine/v3.18/main: temporary error (try again late
+r)\n\x1b[0m'', ''\x1b[91mWARNING: fetching https://dl-cdn.alpinelinux.org/alpine/v3.18/community: temporary error (try again later)\n\x1b[0m'', ''\x1b[91mERROR: unable to select packages:\n  git (no such package
+):\n    required by: world[git]\n  libc6-compat (no such package):\n    required by: world[libc6-compat]\n\x1b[0m'', ''Removing intermediate container 567cff6b368f\n'']'
+</code>
+To test try adding ping in Dockerfile:
+  ...
+  RUN ping -c 4 8.8.8.8
+  ...
+If you get a packet loss that means the docker can't access the Internet. Try first restarting the docker e.g.
+  systemctl restart docker
+If this doesn't work you can build the image with ''--network host'' argument:
+  docker build --network host -t test1 -f Dockerfile .
+In ansible task this looks like:
+<code>
+...
+- name: "Build the docker image"
+  docker_image:
+    name: "{{ full_app_name }}:{{ buildNo }}"
+    repository: "{{ full_app_name }}:latest"
+    state: present
+    build:
+      path: "{{ deploy_helper.new_release_path }}"
+      network: host
+    force: "{{ not (disable_image_force_build | default(false)) }}"
+...
+</code>
+==== Tested on ====
+  * Virtualbox VM Debian 11 Jessie (building inside of this VM)
+  * ansible 2.9.27
+  * docker 24.0.7
+===== Containers lose access to internet suddenly =====
+Try docker version downgrade. I had issues with version 5:28.0.4-1~debian.11~bullseye. Downgrading to 23.0.1 seems to have resolved the problem.
+==== Tested on ====
+  * Debian 11
 ====== See also ======