serrodcal/CONNECTIVITY.md

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CONNECTIVITY.md

DNS checking

getent hosts <dns>

Connection checking without netcat

timeout 5 bash -c '</dev/tcp/<host>/<port>' && echo OK || echo KO

Note: only if bash is available.

Connection using curl

curl --connect-timeout 5 telnet://<host>:<port> && echo OK || echo KO

TLS checking

timeout 5 openssl s_client -connect <host>:<port> </dev/null 2>/dev/null \
  && echo OK || echo KO

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