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From: rdowner <git@git.apache.org>
To: dev@brooklyn.incubator.apache.org
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References: <git-pr-525-incubator-brooklyn@git.apache.org>
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Subject: [GitHub] incubator-brooklyn pull request: Fix: no-hostname,
 and cluster.rep...
Content-Type: text/plain
Message-Id: <20150227105804.14BF1E040E@git1-us-west.apache.org>
Date: Fri, 27 Feb 2015 10:58:04 +0000 (UTC)

Github user rdowner commented on a diff in the pull request:

    https://github.com/apache/incubator-brooklyn/pull/525#discussion_r25499681
  
    --- Diff: core/src/test/java/brooklyn/util/ssh/BashCommandsIntegrationTest.java ---
    @@ -361,6 +363,99 @@ public void testWaitForPortFreeWhenFreedAfterStart() throws Exception {
                 serverSocket.close();
             }
         }
    +
    +    
    +    // Disabled by default because of risk of overriding /etc/hosts in really bad way if doesn't work properly!
    +    // As a manual visual inspection test, consider first manually creating /etc/hostsname and /etc/sysconfig/network
    +    // so that it looks like debian+ubuntu / CentOS/RHEL.
    +    @Test(groups={"Integration"}, enabled=false)
    +    public void testSetHostnameUnqualified() throws Exception {
    +        runSetHostname("br-"+Identifiers.makeRandomId(8).toLowerCase(), null, false);
    +    }
    +
    +    @Test(groups={"Integration"}, enabled=false)
    +    public void testSetHostnameQualified() throws Exception {
    +        runSetHostname("br-"+Identifiers.makeRandomId(8).toLowerCase()+".brooklyn.incubator.apache.org", null, false);
    +    }
    +
    +    @Test(groups={"Integration"}, enabled=false)
    +    public void testSetHostnameNullDomain() throws Exception {
    +        runSetHostname("br-"+Identifiers.makeRandomId(8).toLowerCase(), null, true);
    +    }
    +
    +    @Test(groups={"Integration"}, enabled=false)
    +    public void testSetHostnameNonNullDomain() throws Exception {
    +        runSetHostname("br-"+Identifiers.makeRandomId(8).toLowerCase(), "brooklyn.incubator.apache.org", true);
    +    }
    +
    +    protected void runSetHostname(String newHostname, String newDomain, boolean includeDomain) throws Exception {
    +        String fqdn = (includeDomain && Strings.isNonBlank(newDomain)) ? newHostname + "." + newDomain : newHostname;
    +        
    +        LocalManagementContextForTests mgmt = new LocalManagementContextForTests();
    +        SshMachineLocation loc = mgmt.getLocationManager().createLocation(LocalhostMachineProvisioningLocation.spec()).obtain();
    +
    +        execRequiringZeroAndReturningStdout(loc, sudo("cp /etc/hosts /etc/hosts-orig-testSetHostname")).get();
    +        execRequiringZeroAndReturningStdout(loc, BashCommands.ifFileExistsElse0("/etc/hostname", sudo("cp /etc/hostname /etc/hostname-orig-testSetHostname"))).get();
    +        execRequiringZeroAndReturningStdout(loc, BashCommands.ifFileExistsElse0("/etc/sysconfig/network", sudo("cp /etc/sysconfig/network /etc/sysconfig/network-orig-testSetHostname"))).get();
    +        
    +        String origHostname = getHostname(loc);
    +        assertTrue(Strings.isNonBlank(origHostname));
    +        
    +        try {
    +            List<String> cmd = (includeDomain) ? BashCommands.setHostname(newHostname, newDomain) : BashCommands.setHostname(newHostname);
    +            execRequiringZeroAndReturningStdout(loc, cmd).get();
    +            
    +            assertEquals(getHostname(loc), fqdn);
    +            
    +            String result = execRequiringZeroAndReturningStdout(loc, "grep -n "+fqdn+" /etc/hosts").get();
    +            assertTrue(result.contains("localhost"), "line="+result);
    +            log.info("result="+result);
    --- End diff --
    
    A good test to do would be:
    
    * Executing `hostname` returns the hostname without the domain name
    * Executing `hostname --fqdn` returns the hostname *with* the domain name
    * Executing `ping -c1 -n -q ${ hostname }` return success (rc=0)
    * Executing `ping -c1 -n -q ${ hostname --fqdn }` return success (rc=0)
    
    The last two are probably the most important - it's these kinds of failures that would also cause an entity to fail to bind.
    
    Unfortunately OSX has slightly different parameters - it's `hostname -s` and `hostname -f` respectively.


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