I get this screen after following the rails tutorial instructions to show the Hello, world text in a browser window (Figure 1.15 in the book).
I seem to recall having to specify both the PORT and IP environment variables the last time I ran through the tutorial...but now can't find any reference to these in the book text.
Preview Fails error
I had the same error, and I fixed it by running like this:
$ rails server -p $PORT -b $IP
=> Booting Puma
=> Rails 5.1.4 application starting in development
=> Run `rails server -h` for more startup options
Puma starting in single mode...
* Version 3.9.1 (ruby 2.4.0-p0), codename: Private Caller
* Min threads: 5, max threads: 5
* Environment: development
* Listening on tcp://0.0.0.0:8080
Use Ctrl-C to stop
I haven't yet figured out why I am getting the error, though.
Related
I'm trying to make a website and when I start the use the command rails s it says this:
<code>
$ rails s
=> Booting WEBrick
=> Rails 4.2.5.1 application starting in development on http://localhost:3000
=> Run `rails server -h` for more startup options
=> Ctrl-C to shutdown server
[2016-04-15 15:19:20] INFO WEBrick 1.3.1
[2016-04-15 15:19:20] INFO ruby 2.2.4 (2015-12-16) [i386-mingw32]
[2016-04-15 15:19:20] INFO WEBrick::HTTPServer#start: pid=5892 port=3000
</code>
It doesn't go past that it just gets stuck on that i've port fowarded 3000 and added it to the firewalls exceptions list and still no go it works on my dads connection but not on mine.
These are the commands I use prior to entering rails:
s , rails new instagram_app , cd_instagramapp.
After run command "rails s". Just open a browser window and navigate to http://localhost:3000
Reference: http://guides.rubyonrails.org/getting_started.html#starting-up-the-web-server
I've built my first Munin plugin to give us the size of our Redis queue, but it won't report for some reason. Every other plugin on the node, including other Redis-centric plugins work fine.
Here's the plugin code:
#!/bin/sh
case $1 in
config)
cat <<'EOM'
multigraph redis_queue_size
graph_title Redis Queue Size
graph_info The size of Redis queue
graph_category redis
graph_vlabel Messages
redisqueue.label redisqueue
redisqueue.type GAUGE
redisqueue.min 0
EOM
exit 0;;
esac
queuelength=`redis-cli llen mykeyname`
printf "redisqueue.value "
echo $queuelength
The plugin is in /usr/share/munin/plugins/redis_queue_
The plugin is symlinked to /etc/munin/plugins/redis_queue_
I made sure to restart the service
$ sudo service munin-node force-reload
If I run sudo munin-run redis_queue_ I get the correct output:
redisqueue.value 1567595
If I run munin-node-config I get the following:
redis_queue_ | yes |
If I connect to the instance from the master using telnet to fetch the plugin, I get:
$ telnet 10.101.21.56 4949
Trying 10.101.21.56...
Connected to 10.101.21.56.
Escape character is '^]'.
# munin node at redis01.example.com
fetch redis_queue_
redisqueue.value 1035336
The master shows an empty graph for it, but the "last updated" time isn't increasing. I initially had the plugin configured a little differently (it wasn't producing good output) so all the values are -nan. Once I fixed the output, I expected the plugin to start working, but all efforts have failed.
Everything looks right, but yet still no values in the graph.
Edit: Munin v1.4.6
I'm using python. I did a yum install memcached followed by a easy_install python-memcached
I used the simple test program from the Help(memcache). When I wasn't getting the proper answers I threw in some print statements:
[~/test]$ cat m2.py
import memcache
mc = memcache.Client(['127.0.0.1:11211'], debug=0)
x = mc.set("some_key", "Some value")
print 'Just set a key and value into the cache (suposedly)'
value = mc.get("some_key")
print 'Just retrieved that value from the cache using the key'
print 'X %s' % x
print 'Value %s' % value
[~/test]$ python m2.py
Just set a key and value into the cache (suposedly)
Just retrieved that value from the cache using the key
X 0
Value None
[~/test]$
The question now is, what have I failed to do in my installation? It appears to be working from an API perspective but it fails to put anything into the memcache share area.
I'm using a virtualbox vm running centos
[~]# cat /proc/version
Linux version 2.6.32-358.6.2.el6.i686 (mockbuild#c6b8.bsys.dev.centos.org) (gcc version 4.4.7 20120313 (Red Hat 4.4.7-3) (GCC) ) #1 SMP Thu May 16 18:12:13 UTC 2013
Is there a daemon that is supposed to be running? I don't see an obvious named one when I do a ps.
I tried to get pylibmc installed on my vm but was unable to find a working installation so for now will see if I can get the above stuff working first.
I discovered if i ran straight from the python console GUI i get a bit more output if I set debug=1
>>> mc = memcache.Client(['127.0.0.1:11211'], debug=1)
>>> mc.stats
{}
>>> mc.set('test','value')
MemCached: MemCache: inet:127.0.0.1:11211: connect: Connection refused. Marking dead.
0
>>> mc.get('test')
MemCached: MemCache: inet:127.0.0.1:11211: connect: Connection refused. Marking dead.
When I try to use per the example telnet to connect to the port i get a connection refused:
[root#~]# telnet 127.0.0.1 11211
Trying 127.0.0.1...
telnet: connect to address 127.0.0.1: Connection refused
[root#~]#
I tried the instructions I found on the net for configuring telnet so localhost wouldn't be disabled:
vi /etc/xinetd.d/telnet
service telnet
{
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
disable = no
}
And then ran the commands to restart the service(s):
service iptables stop
service xinetd stop
service iptables start
service xinetd start
service iptables stop
I ran with both cases (iptables started and stopped) but it has no effect. So I am out of ideas. What do I need to do to make it so the PORT will be allowed? if that is the problem?
Or is there a memcached service that needs to be running that needs to open up the port ?
well this is what it took to get it working: ( a series of manual steps )
1) su -
cd /var/run
mkdir memcached # this was missing
In the memcached file I added "-l 127.0.0.1" to the OPTIONS statement. It's apparently a listen option. Do this for steps 2 & 3. I'm not certain which file is actually used at runtime.
2) cd /etc/sysconfig
cp memcached memcached.old
vi memcached
3) cd /etc/init.d
cp memcached memcached.old
vi memcached
4) Try some commands to see if the server starts now
/etc/init.d/memcached start
/etc/init.d/memcached status
/etc/init.d/memcached stop
/etc/init.d/memcached restart
I tried opening a browser, but it never seemed to actually display anything so I don't really know how valid this approach is. I'm not running apache or anything like this so perhaps its not relevant to my cause. Perhaps I would have to supply a ?key=blah or something.
5) http://127.0.0.1:11211
6) Now it should be ready to go. If one runs the test shown with the following it should work. At least it did for me. doing the help(memcache) will display a simple program. just paste that in and it should work just fine.
[~]$ python
>>> import memcache
>>> help(memcache)
I am running fabric to automate deployment. It is painfully slow.
My local environment:
(somenv)bob#sh ~/code/somenv/somenv/fabfile $ > uname -a
Darwin sh.local 12.4.0 Darwin Kernel Version 12.4.0: Wed May 1 17:57:12 PDT 2013; root:xnu-2050.24.15~1/RELEASE_X86_64 x86_64
My fab file:
#!/usr/bin/env python
import logging
import paramiko as ssh
from fabric.api import env, run
env.hosts = [ 'examplesite']
env.use_ssh_config = True
#env.forward_agent = True
logging.basicConfig(level=logging.INFO)
ssh.util.log_to_file('/tmp/paramiko.log')
def uptime():
run('uptime')
Here is the portion of the debug logs:
(somenv)bob#sh ~/code/somenv/somenv/fabfile $ > date;fab -f /Users/bob/code/somenv/somenv/fabfile/pefabfile.py uptime
Sun Aug 11 22:25:03 EDT 2013
[examplesite] Executing task 'uptime'
[examplesite] run: uptime
DEB [20130811-22:25:23.610] thr=1 paramiko.transport: starting thread (client mode): 0x13e4650L
INF [20130811-22:25:23.630] thr=1 paramiko.transport: Connected (version 2.0, client OpenSSH_5.9p1)
DEB [20130811-22:25:23.641] thr=1 paramiko.transport: kex algos:['ecdh-sha2-nistp256', 'ecdh-sha2-nistp384', 'ecdh-sha2-nistp521', 'diffie-hellman-grou
It takes 20 seconds before paramiko is even starting the thread. Surely, Executing task 'uptime' does not take that long. I can manually log in through ssh, type in uptime, and exit in 5-6 seconds. I'd appreciate any help on how to extract mode debug information. I made the changes mentioned here, but no difference.
Try:
env.disable_known_hosts = True
See:
https://github.com/paramiko/paramiko/pull/192
&
Slow public key authentication with paramiko
Maybe it is a problem with DNS resolution and/or IPv6.
A few things you can try:
replacing the server name by its IP address in env.hosts
disabling IPv6
use another DNS server (e.g. OpenDNS)
For anyone looking at this post-2014, paramiko, which was the slow component when checking known hosts, introduced a fix in March 2014 (v1.13), which was allowed as requirement by Fabric in v1.9.0, and backported to v1.8.4 and v1.7.4.
So, upgrade !
Here is a summary:
Objective: Debug a dynamic web application
Environment: MacOS 10.6.8 / Eclipse Helios 20110218-0911 / Tomcat 7
Error: Failed to connect to remote VM. Connection refused.
Story line:
Doing some research on this matter, I found out that the possible problem to this is that I need to start tomcat7 in debug mode which usually acts on port 8000. The command I'm using is ./catalina.sh jpda start which didn't work (it starts tomcat but doesn't start debug mode). So I tried other things like adding this
variables to the system:
declare -x CATALINA_HOME="/Library/Tomcat"
declare -x JPDA_ADDRESS="8000"
declare -x JPDA_TRANSPORT="dt_socket"
and the problem keeps happening.
this is the return of the command: ./catalina.sh jpda start
Using CATALINA_BASE: /Library/Tomcat
Using CATALINA_HOME: /Library/Tomcat
Using CATALINA_TMPDIR: /Library/Tomcat/temp
Using JRE_HOME: /System/Library/Frameworks/JavaVM.framework/Versions/CurrentJDK/Home
Using CLASSPATH: /Library/Tomcat/bin/bootstrap.jar:/Library/Tomcat/bin/tomcat-juli.jar
can anyone help ?
thank you in advance.