I found about
man squid
-f file Use the given config-file instead of /etc/squid/squid.conf . If the file name starts with a ! or | then it is assumed to be
an external command or command line. Can for example be used to pre-process the configuration before it is being read by
Squid. To facilitate this Squid also understands the common #line notion to indicate the real source file.
While I dnot know what "common #line notion" should be (searching on internet matches only the squid man page),
I found the following solution for Ubuntu 18.04 server (Squid 3.5.27):
Create a script
--------------------
/usr/local/script/squid/pre_process_squid_config_file.sh
#!/bin/bash
readonly SQUID_CONFIG_TEMPLATE_FILE='/etc/squid/squid.conf.TEMPLATE'
case "${HOSTNAME}" in
'node1') readonly HOSTNAME_PEER='node2' ;;
'node2') readonly HOSTNAME_PEER='node1' ;;
*)
echo "invalid hostname in script ${0}. Exit"
exit 1
;;
esac
sed \
-e "s@{HOSTNAME}@${HOSTNAME}@g" \
-e "s@{HOSTNAME_PEER}@${HOSTNAME_PEER}@g" \
"${SQUID_CONFIG_TEMPLATE_FILE}"
--------------------
Create file /etc/default/squid with content
CONFIG='|/usr/local/script/squid/pre_process_squid_config_file.sh'
SQUID_ARGS="-YC -f $CONFIG"
Now you can use the Macros {HOSTNAME} (which will give the actual hosts name) and {HOSTNAME_PEER} (name of the other host)
I have only one problem with it, is that a bug?
/usr/sbin/squid -k parse -f '|/usr/local/script/squid/pre_process_squid_config_file.sh'
works, but
/usr/sbin/squid -k reconfigure -f '|/usr/local/script/squid/pre_process_squid_config_file.sh'
gives the following line in /var/log/squid/cache.log
2022/09/16 16:20:55 kid1| storeDirWriteCleanLogs: Starting...
2022/09/16 16:20:55 kid1| Finished. Wrote 0 entries.
2022/09/16 16:20:55 kid1| Took 0.00 seconds ( 0.00 entries/sec).
FATAL: parseConfigFile: '|/usr/local/script/squid/pre_process_squid_config_file.sh' failed with exit code -1
Squid Cache (Version 3.5.27): Terminated abnormally.
CPU Usage: 1.267 seconds = 0.760 user + 0.507 sys
Maximum Resident Size: 107296 KB
Page faults with physical i/o: 7
2022/09/16 16:20:58 kid1| Current Directory is /
_______________________________________________
squid-users mailing list
squid-users@xxxxxxxxxxxxxxxxxxxxx
http://lists.squid-cache.org/listinfo/squid-users
