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Assaf Lavie's questions

Martin Hope
Assaf Lavie
Asked: 2012-03-28 23:15:04 +0800 CST
  • 11

I can see my Ubuntu instance (on a cloud provider) averaging thousands of blocks per second, yet when I observe in real time it's hard to see which process is causing this.

Is there a monitoring command I can employ and let it run for an hour or so and then collect disk usage information (e.g. which processes were most active in this respect, or even which files)?

monitoring disk-usage
Martin Hope
Assaf Lavie
Asked: 2011-06-27 04:21:04 +0800 CST
  • 106

I installed the Bitnami Django stack which included PostgreSQL 8.4.

When I run psql -U postgres I get the following error:

psql: could not connect to server: No such file or directory
    Is the server running locally and accepting
    connections on Unix domain socket "/var/run/postgresql/.s.PGSQL.5432"?

PG is definitely running and the pg_hba.conf file looks like this:

# TYPE  DATABASE        USER            CIDR-ADDRESS            METHOD

# "local" is for Unix domain socket connections only
local   all             all                                     md5
# IPv4 local connections:
host    all             all             127.0.0.1/32            md5
# IPv6 local connections:
host    all             all             ::1/128                 md5

What gives?

"Proof" that pg is running:

root@assaf-desktop:/home/assaf# ps axf | grep postgres
14338 ?        S      0:00 /opt/djangostack-1.3-0/postgresql/bin/postgres -D /opt/djangostack-1.3-0/postgresql/data -p 5432
14347 ?        Ss     0:00  \_ postgres: writer process                                                                        
14348 ?        Ss     0:00  \_ postgres: wal writer process                                                                    
14349 ?        Ss     0:00  \_ postgres: autovacuum launcher process                                                           
14350 ?        Ss     0:00  \_ postgres: stats collector process                                                               
15139 pts/1    S+     0:00              \_ grep --color=auto postgres
root@assaf-desktop:/home/assaf# netstat -nltp | grep 5432
tcp        0      0 127.0.0.1:5432          0.0.0.0:*               LISTEN      14338/postgres  
tcp6       0      0 ::1:5432                :::*                    LISTEN      14338/postgres  
root@assaf-desktop:/home/assaf#
postgresql
Martin Hope
Assaf Lavie
Asked: 2010-12-01 10:48:18 +0800 CST
  • 20

Installed a new Ubuntu 10.04 server and logging in as root I installed haproxy using apt-get.

I can run haproxy directly as a daemon but when I do /etc/init.d/haproxy start nothing happens.. not even an error message.

netstat -a shows nothing is using the http port I'm trying to balance with haproxy...

Ideas?

Edit

  1. I noticed that apt-get install haproxy says this in the end:

    update-rc.d: warning: /etc/init.d/haproxy missing LSB information update-rc.d: see http://wiki.debian.org/LSBInitScripts

  2. /etc/default/haproxy says ENABLED=1

Debugging Output for sh -xv /etc/init.d/haproxy start

#!/bin/sh
#
# chkconfig: - 85 15
# description: HA-Proxy is a TCP/HTTP reverse proxy which is particularly suited \
#              for high availability environments.
# processname: haproxy
# config: /etc/haproxy.cfg
# pidfile: /var/run/haproxy.pid

# Source function library.
if [ -f /etc/init.d/functions ]; then
  . /etc/init.d/functions
elif [ -f /etc/rc.d/init.d/functions ] ; then
  . /etc/rc.d/init.d/functions
else
  exit 0
fi
+ [ -f /etc/init.d/functions ]
+ [ -f /etc/rc.d/init.d/functions ]
+ exit 0
root@li267-63:~#
10.04 server init.d
Martin Hope
Assaf Lavie
Asked: 2010-11-30 07:12:26 +0800 CST
  • 62

I set up my Linux server to accept connections from my home PC by adding the public key generated by PuTTYgen to the authorized_keys file.

Now I'm trying to connect to the same machine, but this time from another Ubuntu machine. I have to use the same private key (for a weird reason, don't ask..) and I don't quite get how to install it on my client Ubuntu.

Do I have to convert it to some other format?

ssh openssh putty