updating gh-pages repo

v2/examples/ex-ping.md

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+<div style="text-align:right"><a href="./index">Back to Index</a></div>
+
+
+## Using ping to check network quality
+Server group A has members A1, A2, ..., A10, which share the same database server B. 
+You want to regularly check the connection states from group A to B. 
+This example shows how to connect to all servers in group A and execute the "ping" command to database server B.
+
+```
+databaseServer = '192.168.1.100'
+## suppose they share the same credentials
+username = 'user'
+password = '1234'
+groupsA = []
+for i in range(10):
+    groupsA.append([f'{username}@host{i}',password)
+## This keeps average speeds of "ping"
+states = {}
+for account,password in group:
+    with $.connect(account,password) as host:
+        $f'ping -c 3 -w 3 {databaseServer}'
+        if 'transmitted' in line:
+            ## eg. 3 packets transmitted, 3 received, 0% packet loss, time 2003ms
+            words = line.split()
+            received, time = int(cols[3]),int(cols[9][:-2])
+            avg = sum(times)/len(times) if len(times) else 0
+            states[account] = time / received if received else 0
+```

v2/examples/index.md

@@ -5,4 +5,5 @@ Last Updated on 2023/10/31
 
 * [Checking the syncing status of two MySQL servers](mysqlsyncstate)
 * [Who is attacking your server?](ex-lasdb)
-* [Check Disk Usage](ex-df)
+* [Check Disk Usage](ex-df)
+* [Using ping to check network quality](ex-ping