I tried your post here
https://meta.discourse.org/t/disabled-cdn-emoji-picture-url-error/20878/2?u=trandatnh
But I received this error:
rake posts:rebake
rake aborted!
No Rakefile found (looking for: rakefile, Rakefile, rakefile.rb, Rakefile.rb)
(See full trace by running task with --trace)
I think it is because the answer was very old.
I added --trace
root@daynhauhoc:/var/discourse# rake posts:rebake --trace
rake aborted!
No Rakefile found (looking for: rakefile, Rakefile, rakefile.rb, Rakefile.rb)
/usr/lib/ruby/vendor_ruby/rake/application.rb:584:in `raw_load_rakefile'
/usr/lib/ruby/vendor_ruby/rake/application.rb:89:in `block in load_rakefile'
/usr/lib/ruby/vendor_ruby/rake/application.rb:160:in `standard_exception_handling'
/usr/lib/ruby/vendor_ruby/rake/application.rb:88:in `load_rakefile'
/usr/lib/ruby/vendor_ruby/rake/application.rb:72:in `block in run'
/usr/lib/ruby/vendor_ruby/rake/application.rb:160:in `standard_exception_handling'
/usr/lib/ruby/vendor_ruby/rake/application.rb:70:in `run'
/usr/bin/rake:27:in `<main>'