Update session 4 with working instructions.

cloneme/example.c

@@ -0,0 +1,31 @@
+#define _GNU_SOURCE
+#include <sys/types.h>
+#include <sys/wait.h>
+#include <stdio.h>
+#include <sched.h>
+#include <signal.h>
+#include <unistd.h>
+
+#define STACK_SIZE (1024 * 1024)
+
+static char child_stack[STACK_SIZE];
+char* const child_args[] = {
+    "/bin/bash",
+    NULL
+};
+
+int child_main(void* arg)
+{
+    sethostname("In Namespace", 12);
+    execv(child_args[0], child_args);
+    return 1;
+}
+
+int main()
+{
+    int child_pid = clone(child_main, child_stack+STACK_SIZE,
+            CLONE_NEWUTS | SIGCHLD, NULL);
+    waitpid(child_pid, NULL, 0);
+    return 0;
+}
+

session4/lecture.md

@@ -84,8 +84,29 @@ We need a pod, and an image, which is your hello-node image.
 Put It On The Internet
 ====
 
-1. Go to the GCE GUI and set "Allow HTTP Traffic".
-2. Go to the IP address on that page with your browser.
+You can also use gcloud to expose ports, but it sometimes doesn't work:
+
+    kubectl get nodes
+
+Get the part up-to-and-including the -node
+
+
+
+Firewall Rules
+====
+
+    gcloud compute firewall-rules create hello-world-8080 \
+        --allow tcp:8080 \
+        --target-tags <node-name-prefix>
+    kubectl expose rc hello-node --create-external-load-balancer=true
+    kubectl get services hello-node
+
+
+
+Visit It
+====
+
+Visit the second IP address at port 8080.
 
 
 
@@ -112,6 +133,18 @@ All Commands Used
 
 
 
+Firewall Commands
+====
+
+    kubectl get nodes
+    gcloud compute firewall-rules create hello-world-8080 \
+        --allow tcp:8080 \
+        --target-tags <node-name-prefix>
+    kubectl expose rc hello-node --create-external-load-balancer=true
+    kubectl get services hello-node
+
+
+
 Where These Are Documented
 ====
 
@@ -129,25 +162,6 @@ Command Line Help
 
 
 
-Note on Ports and Firewalls
-====
-
-You can also use gcloud to expose ports, but it sometimes doesn't work:
-
-    kubectl get nodes
-    gcloud compute firewall-rules create hello-world-PORT --allow tcp:PORT \
-        --target-tags <node-name-prefix>
-    kubectl expose rc hello-node --create-external-load-balancer=true
-    kubectl get services hello-node
-
-
-
-We'll Try That Next
-====
-
-If it doesn't work then just use the GUI.
-
-
 
 Kubernetes Podwan Level 2
 ====
@@ -234,10 +248,8 @@ View And Deploy Wordpress
 Expose Wordpress
 ====
 
-We will try this, but use the GUI if it doesn't work:
-
     kubectl get nodes
-    gcloud compute firewall-rules create wppd-world-80 --allow tcp:80 \
+    gcloud compute firewall-rules create wppd-80 --allow tcp:80 \
         --target-tags gke-wppd-XXX-node
     kubectl expose rc hello-node --create-external-load-balancer=true
     kubectl get services hello-node
@@ -256,15 +268,6 @@ You've deployed from a docker and from YAML configurations.
 
 
 
-But First, This Important Message
-====
-
-A video from Mesosphere showing Kubernets on DCOS making all of this even easier.
-
-k8s-on-dcos-voiceover.mp4
-
-
-
 End Of Lecture 
 =====