docker-debian.sh always fails because known_hosts.sh fails with "ssh-keyscan failed, no more retries left"

[KillerKelvUK]

Building via the included script fails in 100% of my test with an error message "ssh-keyscan failed, no more retries left". I tracked this back to known_hosts.sh and have been trying to run this manually for the last day and a half with no success. Is this just me or is it now unreasonable to assume the big 6 domains won't all reply in a timely maner to a keyscan?

I have increased the retries, I've also increased the keyscan timeout but the results vary widely and I just cannot get a successful keyscan from all 6 domains in a single run of the script. Any help would be appreicated.

[hardillb]

I've just tested the script locally and it's working fine.

The script needs to be able to reach all the git providers in it's list to be able to pull their public SSH keys to populate the file in the container, if it can't reach them it will fail, increasing the attempts won't fix it if it can't ever reach the hosts.

Where are you running the build? does it full internet access?

Also what is the output of the script, just saying it fails doesn't really help us know why.

[hardillb]

And the servers need to respond, because all a ssh-keyscan does is open a new SSH connection, which is not distinguishable from doing a git push over ssh

[KillerKelvUK]

My build host has full internet access so is able to get to the git providers without issue.

The reason for failure is always the same, it doesn't get a key off all the providers in a single run of the script and so fails the fingerprint validation each and every time until the retries limit is reached.

The providers with no response vary within a single run of the script e.g. providers with successful scan can/do change between retries however I've noted googles seem more consistent.

How did you test it?

stdout from clean pull and run of docker-debian.sh...

# ./docker-debian.sh
#########################################################################
node-red version: 3.1.9
#########################################################################
DEPRECATED: The legacy builder is deprecated and will be removed in a future release.
            Install the buildx component to build images with BuildKit:
            https://docs.docker.com/go/buildx/

Sending build context to Docker daemon  36.86kB
Step 1/30 : ARG ARCH=amd64
Step 2/30 : ARG NODE_VERSION=16
Step 3/30 : ARG OS=buster-slim
Step 4/30 : FROM ${ARCH}/node:${NODE_VERSION}-${OS} AS base
 ---> eb8b8b8a3610
Step 5/30 : COPY scripts/*.sh /tmp/
 ---> cc53cb5f8553
Step 6/30 : RUN set -ex &&     apt-get update && apt-get install -y         bash         tzdata         curl         nano         wget         git         openssl         openssh-client         ca-certificates &&     mkdir -p /usr/src/node-red /data &&     deluser --remove-home node &&     useradd --home-dir /usr/src/node-red --uid 1000 node-red &&     chown -R node-red:root /data && chmod -R g+rwX /data &&     chown -R node-red:root /usr/src/node-red && chmod -R g+rwX /usr/src/node-red
 ---> Running in a50438664673
+ apt-get update
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Get:6 http://deb.debian.org/debian buster-updates/main amd64 Packages [8788 B]
Fetched 8728 kB in 1s (9233 kB/s)
Reading package lists...
+ apt-get install -y bash tzdata curl nano wget git openssl openssh-client ca-certificates
Reading package lists...
Building dependency tree...
Reading state information...
bash is already the newest version (5.0-4).
bash set to manually installed.
The following package was automatically installed and is no longer required:
  lsb-base
Use 'apt autoremove' to remove it.
The following additional packages will be installed:
  git-man krb5-locales less libbsd0 libcurl3-gnutls libcurl4 libedit2
  liberror-perl libexpat1 libgdbm-compat4 libgdbm6 libgssapi-krb5-2
  libk5crypto3 libkeyutils1 libkrb5-3 libkrb5support0 libldap-2.4-2
  libldap-common libnghttp2-14 libpcre2-8-0 libperl5.28 libpsl5 librtmp1
  libsasl2-2 libsasl2-modules libsasl2-modules-db libssh2-1 libssl1.1 libx11-6
  libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 netbase patch perl
  perl-modules-5.28 publicsuffix xauth
Suggested packages:
  gettext-base git-daemon-run | git-daemon-sysvinit git-doc git-el git-email
  git-gui gitk gitweb git-cvs git-mediawiki git-svn gdbm-l10n krb5-doc
  krb5-user sensible-utils libsasl2-modules-gssapi-mit
  | libsasl2-modules-gssapi-heimdal libsasl2-modules-ldap libsasl2-modules-otp
  libsasl2-modules-sql spell keychain libpam-ssh monkeysphere ssh-askpass ed
  diffutils-doc perl-doc libterm-readline-gnu-perl
  | libterm-readline-perl-perl make libb-debug-perl liblocale-codes-perl
The following NEW packages will be installed:
  ca-certificates curl git git-man krb5-locales less libbsd0 libcurl3-gnutls
  libcurl4 libedit2 liberror-perl libexpat1 libgdbm-compat4 libgdbm6
  libgssapi-krb5-2 libk5crypto3 libkeyutils1 libkrb5-3 libkrb5support0
  libldap-2.4-2 libldap-common libnghttp2-14 libpcre2-8-0 libperl5.28 libpsl5
  librtmp1 libsasl2-2 libsasl2-modules libsasl2-modules-db libssh2-1 libssl1.1
  libx11-6 libx11-data libxau6 libxcb1 libxdmcp6 libxext6 libxmuu1 nano
  netbase openssh-client openssl patch perl perl-modules-5.28 publicsuffix
  wget xauth
The following packages will be upgraded:
  tzdata
1 upgraded, 48 newly installed, 0 to remove and 17 not upgraded.
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debconf: (TERM is not set, so the dialog frontend is not usable.)
debconf: falling back to frontend: Readline
Setting up krb5-locales (1.17-3+deb10u6) ...
Setting up libldap-common (2.4.47+dfsg-3+deb10u7) ...
Setting up libkrb5support0:amd64 (1.17-3+deb10u6) ...
Setting up libsasl2-modules-db:amd64 (2.1.27+dfsg-1+deb10u2) ...
Setting up tzdata (2024a-0+deb10u1) ...
debconf: unable to initialize frontend: Dialog
debconf: (TERM is not set, so the dialog frontend is not usable.)
debconf: falling back to frontend: Readline

Current default time zone: 'Etc/UTC'
Local time is now:      Fri May 24 13:10:38 UTC 2024.
Universal Time is now:  Fri May 24 13:10:38 UTC 2024.
Run 'dpkg-reconfigure tzdata' if you wish to change it.

Setting up libx11-data (2:1.6.7-1+deb10u4) ...
Setting up librtmp1:amd64 (2.4+20151223.gitfa8646d.1-2) ...
Setting up patch (2.7.6-3+deb10u1) ...
Setting up libpcre2-8-0:amd64 (10.32-5+deb10u1) ...
Setting up libk5crypto3:amd64 (1.17-3+deb10u6) ...
Setting up libsasl2-2:amd64 (2.1.27+dfsg-1+deb10u2) ...
Setting up nano (3.2-3) ...
update-alternatives: using /bin/nano to provide /usr/bin/editor (editor) in auto mode
update-alternatives: warning: skip creation of /usr/share/man/man1/editor.1.gz because associated file /usr/share/man/man1/nano.1.gz (of link group editor) doesn't exist
update-alternatives: using /bin/nano to provide /usr/bin/pico (pico) in auto mode
update-alternatives: warning: skip creation of /usr/share/man/man1/pico.1.gz because associated file /usr/share/man/man1/nano.1.gz (of link group pico) doesn't exist
Setting up git-man (1:2.20.1-2+deb10u8) ...
Setting up libssh2-1:amd64 (1.8.0-2.1+deb10u1) ...
Setting up netbase (5.6) ...
Setting up libkrb5-3:amd64 (1.17-3+deb10u6) ...
Setting up openssl (1.1.1n-0+deb10u6) ...
Setting up libbsd0:amd64 (0.9.1-2+deb10u1) ...
Setting up publicsuffix (20220811.1734-0+deb10u1) ...
Setting up libgdbm6:amd64 (1.18.1-4) ...
Setting up libxdmcp6:amd64 (1:1.1.2-3) ...
Setting up libxcb1:amd64 (1.13.1-2) ...
Setting up wget (1.20.1-1.1) ...
Setting up libedit2:amd64 (3.1-20181209-1) ...
Setting up libldap-2.4-2:amd64 (2.4.47+dfsg-3+deb10u7) ...
Setting up ca-certificates (20200601~deb10u2) ...
debconf: unable to initialize frontend: Dialog
debconf: (TERM is not set, so the dialog frontend is not usable.)
debconf: falling back to frontend: Readline
Updating certificates in /etc/ssl/certs...
137 added, 0 removed; done.
Setting up libgssapi-krb5-2:amd64 (1.17-3+deb10u6) ...
Setting up libgdbm-compat4:amd64 (1.18.1-4) ...
Setting up libperl5.28:amd64 (5.28.1-6+deb10u1) ...
Setting up libcurl4:amd64 (7.64.0-4+deb10u9) ...
Setting up libx11-6:amd64 (2:1.6.7-1+deb10u4) ...
Setting up curl (7.64.0-4+deb10u9) ...
Setting up libxmuu1:amd64 (2:1.1.2-2+b3) ...
Setting up openssh-client (1:7.9p1-10+deb10u4) ...
Setting up libxext6:amd64 (2:1.3.3-1+b2) ...
Setting up libcurl3-gnutls:amd64 (7.64.0-4+deb10u9) ...
Setting up perl (5.28.1-6+deb10u1) ...
Setting up xauth (1:1.0.10-1) ...
Setting up liberror-perl (0.17027-2) ...
Setting up git (1:2.20.1-2+deb10u8) ...
Processing triggers for libc-bin (2.28-10+deb10u2) ...
Processing triggers for ca-certificates (20200601~deb10u2) ...
Updating certificates in /etc/ssl/certs...
0 added, 0 removed; done.
Running hooks in /etc/ca-certificates/update.d...
done.
+ mkdir -p /usr/src/node-red /data
+ deluser --remove-home node
Looking for files to backup/remove ...
Removing files ...
Removing user `node' ...
Warning: group `node' has no more members.
Done.
+ useradd --home-dir /usr/src/node-red --uid 1000 node-red
+ chown -R node-red:root /data
+ chmod -R g+rwX /data
+ chown -R node-red:root /usr/src/node-red
+ chmod -R g+rwX /usr/src/node-red
Removing intermediate container a50438664673
 ---> 6b5668508d63
Step 7/30 : WORKDIR /usr/src/node-red
 ---> Running in ce51f66de9e9
Removing intermediate container ce51f66de9e9
 ---> 87b9e96dc39f
Step 8/30 : COPY known_hosts.sh .
 ---> 424777cdad64
 Step 9/30 : RUN ./known_hosts.sh /etc/ssh/ssh_known_hosts && rm /usr/src/node-red/known_hosts.sh
 ---> Running in eee9be4ccf26
# github.com:22 SSH-2.0-babeld-33961236
# github.com:22 SSH-2.0-babeld-33961236
# gitlab.com:22 SSH-2.0-GitLab-SSHD
# ssh.dev.azure.com:22 SSH-2.0-SSHBlackbox.10
# ssh.dev.azure.com:22 SSH-2.0-SSHBlackbox.10
# ssh.dev.azure.com:22 SSH-2.0-SSHBlackbox.10
# vs-ssh.visualstudio.com:22 SSH-2.0-SSHBlackbox.10
# github.com:22 SSH-2.0-babeld-33961236
# gitlab.com:22 SSH-2.0-GitLab-SSHD
# gitlab.com:22 SSH-2.0-GitLab-SSHD
# bitbucket.org:22 SSH-2.0-conker_41243d16c6 a7aa73b8164c
# bitbucket.org:22 SSH-2.0-conker_41243d16c6 1bf2f156cb71
# bitbucket.org:22 SSH-2.0-conker_41243d16c6 958a60664cb6
# vs-ssh.visualstudio.com:22 SSH-2.0-SSHBlackbox.10
# vs-ssh.visualstudio.com:22 SSH-2.0-SSHBlackbox.10
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
1,3d0
< 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
7,8d3
< 256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
< 256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
# github.com:22 SSH-2.0-babeld-33961236
# github.com:22 SSH-2.0-babeld-33961236
# github.com:22 SSH-2.0-babeld-33961236
# bitbucket.org:22 SSH-2.0-conker_41243d16c6 958a60664cb6
# bitbucket.org:22 SSH-2.0-conker_41243d16c6 f56bd7429f9c
# bitbucket.org:22 SSH-2.0-conker_41243d16c6 e119d16451ea
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
1,3d0
< 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
7,8d3
< 256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
< 256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
1,4d0
< 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
< 256 SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU github.com (ED25519)
6,12d1
< 256 SHA256:FC73VB6C4OQLSCrjEayhMp9UMxS97caD/Yyi2bhW/J0 bitbucket.org (ECDSA)
< 256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
< 256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
< 256 SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM github.com (ECDSA)
< 256 SHA256:ybgmFkzwOSotHTHLJgHO0QN8L0xErw6vd0VhFA9m3SM bitbucket.org (ED25519)
< 3072 SHA256:46OSHA1Rmj8E8ERTC6xkNcmGOw9oFxYr0WF6zWW8l1E bitbucket.org (RSA)
< 3072 SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s github.com (RSA)
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
1,4d0
< 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
< 256 SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU github.com (ED25519)
6,12d1
< 256 SHA256:FC73VB6C4OQLSCrjEayhMp9UMxS97caD/Yyi2bhW/J0 bitbucket.org (ECDSA)
< 256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
< 256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
< 256 SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM github.com (ECDSA)
< 256 SHA256:ybgmFkzwOSotHTHLJgHO0QN8L0xErw6vd0VhFA9m3SM bitbucket.org (ED25519)
< 3072 SHA256:46OSHA1Rmj8E8ERTC6xkNcmGOw9oFxYr0WF6zWW8l1E bitbucket.org (RSA)
< 3072 SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s github.com (RSA)
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
1,4d0
< 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
< 256 SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU github.com (ED25519)
6,12d1
< 256 SHA256:FC73VB6C4OQLSCrjEayhMp9UMxS97caD/Yyi2bhW/J0 bitbucket.org (ECDSA)
< 256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
< 256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
< 256 SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM github.com (ECDSA)
< 256 SHA256:ybgmFkzwOSotHTHLJgHO0QN8L0xErw6vd0VhFA9m3SM bitbucket.org (ED25519)
< 3072 SHA256:46OSHA1Rmj8E8ERTC6xkNcmGOw9oFxYr0WF6zWW8l1E bitbucket.org (RSA)
< 3072 SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s github.com (RSA)
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
1,4d0
< 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
< 256 SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU github.com (ED25519)
6,12d1
< 256 SHA256:FC73VB6C4OQLSCrjEayhMp9UMxS97caD/Yyi2bhW/J0 bitbucket.org (ECDSA)
< 256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
< 256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
< 256 SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM github.com (ECDSA)
< 256 SHA256:ybgmFkzwOSotHTHLJgHO0QN8L0xErw6vd0VhFA9m3SM bitbucket.org (ED25519)
< 3072 SHA256:46OSHA1Rmj8E8ERTC6xkNcmGOw9oFxYr0WF6zWW8l1E bitbucket.org (RSA)
< 3072 SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s github.com (RSA)
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
1,4d0
< 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
< 256 SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU github.com (ED25519)
6,12d1
< 256 SHA256:FC73VB6C4OQLSCrjEayhMp9UMxS97caD/Yyi2bhW/J0 bitbucket.org (ECDSA)
< 256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
< 256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
< 256 SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM github.com (ECDSA)
< 256 SHA256:ybgmFkzwOSotHTHLJgHO0QN8L0xErw6vd0VhFA9m3SM bitbucket.org (ED25519)
< 3072 SHA256:46OSHA1Rmj8E8ERTC6xkNcmGOw9oFxYr0WF6zWW8l1E bitbucket.org (RSA)
< 3072 SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s github.com (RSA)
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
1,4d0
< 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
< 256 SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU github.com (ED25519)
6,12d1
< 256 SHA256:FC73VB6C4OQLSCrjEayhMp9UMxS97caD/Yyi2bhW/J0 bitbucket.org (ECDSA)
< 256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
< 256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
< 256 SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM github.com (ECDSA)
< 256 SHA256:ybgmFkzwOSotHTHLJgHO0QN8L0xErw6vd0VhFA9m3SM bitbucket.org (ED25519)
< 3072 SHA256:46OSHA1Rmj8E8ERTC6xkNcmGOw9oFxYr0WF6zWW8l1E bitbucket.org (RSA)
< 3072 SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s github.com (RSA)
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
1,4d0
< 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
< 256 SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU github.com (ED25519)
6,12d1
< 256 SHA256:FC73VB6C4OQLSCrjEayhMp9UMxS97caD/Yyi2bhW/J0 bitbucket.org (ECDSA)
< 256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
< 256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
< 256 SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM github.com (ECDSA)
< 256 SHA256:ybgmFkzwOSotHTHLJgHO0QN8L0xErw6vd0VhFA9m3SM bitbucket.org (ED25519)
< 3072 SHA256:46OSHA1Rmj8E8ERTC6xkNcmGOw9oFxYr0WF6zWW8l1E bitbucket.org (RSA)
< 3072 SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s github.com (RSA)
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
1,4d0
< 2048 SHA256:ROQFvPThGrW4RuWLoL9tq9I9zJ42fK4XywyRtbOz/EQ gitlab.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og ssh.dev.azure.com (RSA)
< 2048 SHA256:ohD8VZEXGWo6Ez8GSEJQ9WpafgLFsOfLOtGGQCQo6Og vs-ssh.visualstudio.com (RSA)
< 256 SHA256:+DiY3wvvV6TuJJhbpZisF/zLDA0zPMSvHdkr4UvCOqU github.com (ED25519)
6,12d1
< 256 SHA256:FC73VB6C4OQLSCrjEayhMp9UMxS97caD/Yyi2bhW/J0 bitbucket.org (ECDSA)
< 256 SHA256:HbW3g8zUjNSksFbqTiUWPWg2Bq1x8xdGUrliXFzSnUw gitlab.com (ECDSA)
< 256 SHA256:eUXGGm1YGsMAS7vkcx6JOJdOGHPem5gQp4taiCfCLB8 gitlab.com (ED25519)
< 256 SHA256:p2QAMXNIC1TJYWeIOttrVc98/R1BUFWu3/LiyKgUfQM github.com (ECDSA)
< 256 SHA256:ybgmFkzwOSotHTHLJgHO0QN8L0xErw6vd0VhFA9m3SM bitbucket.org (ED25519)
< 3072 SHA256:46OSHA1Rmj8E8ERTC6xkNcmGOw9oFxYr0WF6zWW8l1E bitbucket.org (RSA)
< 3072 SHA256:uNiVztksCsDhcc0u9e8BujQXVUpKZIDTMczCvj3tD2s github.com (RSA)
ssh-keyscan failed, no more retries left
The command '/bin/sh -c ./known_hosts.sh /etc/ssh/ssh_known_hosts && rm /usr/src/node-red/known_hosts.sh' returned a non-zero code: 1

[hardillb]

Testing is just running the script with an output file e.g.

./known_hosts.sh foo

1 thing to check, do you have an IPv6 enabled network?

I'm wondering if the failing providers are dual homed on bouth IPv4 and IPv6 and for some of them it's resolving the hostname to the IPv6 address and it can't be reached from your machine. source.developers.google.com is definitely dual homed.

[hardillb]

Also if you are not using the Node-RED projects feature to store flows in a git repo, you can just comment out that section of the Dockerfile as you won't need it.

[KillerKelvUK]

No, IPv6 is disabled as my ISP doesn't support it yet. However I temporarily tethered by build host to my LTE provider which does support IPv6 and presto github started to work. Oddly though github isn't dualhomed whereas google is and works fine from my wired/fibre connection.

Could this be more a rate limiting concern with my public IPv4 subnet which github and others are applying?

This is what I'm getting from by build host on my fibre connection...

> nslookup source.developers.google.com
Server:         8.8.8.8
Address:        8.8.8.8#53

Non-authoritative answer:
Name:   source.developers.google.com
Address: 74.125.133.82
Name:   source.developers.google.com
Address: 2a00:1450:400c:c07::52

> nslookup github.com
Server:         8.8.8.8
Address:        8.8.8.8#53

Non-authoritative answer:
Name:   github.com
Address: 20.26.156.215

> ssh-keyscan -4 -p 2022 source.developers.google.com
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
[source.developers.google.com]:2022 ecdsa-sha2-nistp256 AAAAE2VjZHNhLXNoYTItbmlzdHAyNTYAAAAIbmlzdHAyNTYAAABBBB5Iy4/cq/gt/fPqe3uyMy4jwv1Alc94yVPxmnwNhBzJqEV5gRPiRk5u4/JJMbbu9QUVAguBABxL7sBZa5PH/xY=
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go
# source.developers.google.com:2022 SSH-2.0-Go

> ssh-keyscan -4 github.com
# github.com:22 SSH-2.0-babeld-33961236
# github.com:22 SSH-2.0-babeld-33961236
# github.com:22 SSH-2.0-babeld-33961236
# github.com:22 SSH-2.0-babeld-33961236
# github.com:22 SSH-2.0-babeld-33961236

[KillerKelvUK]

So this is definately a local network issue, my router is mangling the outbound SSH connections, probably a false positive on the IDP process. Thanks for the assistance.