Yiyiyimu commented on a change in pull request #2036:
URL: https://github.com/apache/apisix/pull/2036#discussion_r489460767



##########
File path: bin/apisix
##########
@@ -879,35 +887,35 @@ local function init_etcd(show_output)
 
     local host_count = #(yaml_conf.etcd.host)
 
-    -- check whether the user has enabled etcd v2 protocol
+    local etcd_ok = false
     for index, host in ipairs(yaml_conf.etcd.host) do
-        uri = host .. "/v2/keys"
-        local cmd = "curl -i -m ".. timeout * 2 .. " -o /dev/null -s -w 
%{http_code} " .. uri
+        -- check if etcd version above 3.4
+        cmd = "curl " .. host .. "/version 2>&1"
         local res = excute_cmd(cmd)
-        if res == "404" then
-            io.stderr:write(string.format("failed: please make sure that you 
have enabled the v2 protocol of etcd on %s.\n", host))
+        local op_ver = str_split(res, "\"")[4]
+        local need_ver = "3.4.0"
+        if not check_version(op_ver, need_ver) then
+            io.stderr:write("etcd version must >=", need_ver, " current ", 
op_ver, "\n")
             return
         end
-    end
-
-    local etcd_ok = false
-    for index, host in ipairs(yaml_conf.etcd.host) do
 
         local is_success = true
-        uri = host .. "/v2/keys" .. (etcd_conf.prefix or "")
 
         for _, dir_name in ipairs({"/routes", "/upstreams", "/services",
                                    "/plugins", "/consumers", "/node_status",
                                    "/ssl", "/global_rules", "/stream_routes",
                                    "/proto"}) do
-            local cmd = "curl " .. uri .. dir_name
-                    .. "?prev_exist=false -X PUT -d dir=true "
-                    .. "--connect-timeout " .. timeout
+            local key =  (etcd_conf.prefix or "") .. dir_name .. "/"
+
+            local base64_encode = require("base64").encode
+            local uri = host .. "/v3/kv/put"
+            local post_json = '{"value":"' .. base64_encode("init_dir") ..  
'", "key":"' .. base64_encode(key) .. '"}'
+            cmd = "curl " .. uri .. " -X POST -d '" .. post_json
+                    .. "' --connect-timeout " .. timeout
                     .. " --max-time " .. timeout * 2 .. " --retry 1 2>&1"
 
             local res = excute_cmd(cmd)
-            if not res:find("index", 1, true)
-                    and not res:find("createdIndex", 1, true) then
+            if (etcd_version == "v3" and not res:find("OK", 1, true)) then

Review comment:
       fix by #2233 




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