imported>Jeremy-busk at 18:29, 5 June 2019

2019-06-05T18:29:44Z

New page

```
location = /healthcheck {

content_by_lua_block {
local redis = require "resty.redis"
local red = redis:new()
red:set_timeout(1000)
local ok, err = red:connect("127.0.0.1", 6379)
if not ok then
ngx.status = 500
return
end

local ps = io.popen("/bin/ps aux >/tmp/ps.out", "w")
ps:close()
local ps = io.popen("grep -c '[j]ava.*63' /tmp/ps.out")
local output = tostring(ps:read())
ps:close()
if string.match(output, '4') then
ngx.status = 200
else
ngx.status = 500
end

}

}
```

```

f = assert (io.popen ("ls -l"))

for line in f:lines() do
print(line)
end -- for loop

f:close()

An alternative to using pipes, if you want to capture operating system output, is to redirect command output to a temporary file, like this:

-- get a temporary file name
n = os.tmpname ()

-- execute a command
os.execute ("dir > " .. n)

-- display output
for line in io.lines (n) do
print (line)
end

-- remove temporary file
os.remove (n)
```

LUA NGINX Examples - Revision history

imported>Jeremy-busk at 18:29, 5 June 2019