Обсуждение: psql: could not connect to server: Network is unreachable
Is the server running on host "localhost" and accepting
TCP/IP connections on port 5432?
Now, I'm really confused because I used to have postgre 7 installed on
my Debian without any serious problems with the configuration. Right
now, I'm using Ubuntu Breezy and postgre 8.
I have used the sample .conf files to set my own
at /var/lib/postgres/data
the only two un-commented lines at the postgresql.conf are :
listen_addresses = 'localhost' # what IP interface(s) to listen on;
# defaults to localhost, '*' = any
port = 5432
And my pg_hba.conf is :
# TYPE DATABASE USER CIDR-ADDRESS METHOD
local all all trust
# The same using local loopback TCP/IP connections.
#
# TYPE DATABASE USER CIDR-ADDRESS METHOD
host all all 127.0.0.1/32 trust
host all all ::1/128 trust
The command I issue to get this reply is :
psql -h localhost -U markulis
Also, I don't know if it is of any importance, but if I issue the
command while online, it simply hangs. I have also experienced the same
problem while trying to connect from pgadmin3.
I really need some help on this, because I have to present my diploma
work in short time and the system doesn't work.
Hi, can you check if postmaster is running on your machine using the following command ps -aef | grep postmaster Also check check if postgres is listening on port 5432 using netstat -na | grep ':5432' On 1/4/06, markos <el96645@mail.ntua.gr> wrote: > Is the server running on host "localhost" and accepting > TCP/IP connections on port 5432? > > Now, I'm really confused because I used to have postgre 7 installed on > my Debian without any serious problems with the configuration. Right > now, I'm using Ubuntu Breezy and postgre 8. > > I have used the sample .conf files to set my own > at /var/lib/postgres/data > > the only two un-commented lines at the postgresql.conf are : > > listen_addresses = 'localhost' # what IP interface(s) to listen on; > # defaults to localhost, '*' = any > port = 5432 > > And my pg_hba.conf is : > > # TYPE DATABASE USER CIDR-ADDRESS METHOD > local all all trust > # The same using local loopback TCP/IP connections. > # > # TYPE DATABASE USER CIDR-ADDRESS METHOD > host all all 127.0.0.1/32 trust > host all all ::1/128 trust > > The command I issue to get this reply is : > psql -h localhost -U markulis > > Also, I don't know if it is of any importance, but if I issue the > command while online, it simply hangs. I have also experienced the same > problem while trying to connect from pgadmin3. > > I really need some help on this, because I have to present my diploma > work in short time and the system doesn't work. > > > ---------------------------(end of broadcast)--------------------------- > TIP 9: In versions below 8.0, the planner will ignore your desire to > choose an index scan if your joining column's datatypes do not > match >
markos <el96645@mail.ntua.gr> writes:
> Is the server running on host "localhost" and accepting
> TCP/IP connections on port 5432?
Please show the *entire* error message, not just the part you think
is important.
regards, tom lane
First of all, thanks for the swift replies.
The whole error message is actually this :
psql -h localhost -U markulis
psql: could not connect to server: Network is unreachable
Is the server running on host "localhost" and accepting
TCP/IP connections on port 5432?
the result of :
ps -aef | grep postmaster
is
postgres 8702 1 0 19:08 pts/1
00:00:00 /usr/lib/postgresql/8.0/bin/postmaster
-D /var/lib/postgresql/8.0/main -c
unix_socket_directory=/var/run/postgresql -c
config_file=/etc/postgresql/8.0/main/postgresql.conf -c
hba_file=/etc/postgresql/8.0/main/pg_hba.conf -c
ident_file=/etc/postgresql/8.0/main/pg_ident.conf
root 8811 8560 0 19:17 pts/1 00:00:00 grep postmaster
what I realized from this is that postmaster uses diferrent .conf files
than what I thought. Yet, I changed them too and nothing happened.
(The postgresql.conf on this directory had
listen_addresses = 'localhost'
commented out, but the default is localhost anyway)
the result of :
netstat -na | grep ':5432'
is nothing
I suppose that this suggests postmaster is not listening to port 5432.
But both postgresql.conf that I have on my system have the line
port = 5432
markos <el96645@mail.ntua.gr> writes:
> psql -h localhost -U markulis
> psql: could not connect to server: Network is unreachable
> Is the server running on host "localhost" and accepting
> TCP/IP connections on port 5432?
Hm. "Network is unreachable" means that you have got a networking
problem not a database problem. You'll probably find that simple
commands like "ping localhost" don't work either. The problem could
be a DNS issue --- what does "nslookup localhost" say? If it comes
back with something reasonable, then you've got a kernel
misconfiguration issue, which I don't think I can help you with.
regards, tom lane
On Wed, 2006-01-04 at 12:51 -0500, Tom Lane wrote: > markos <el96645@mail.ntua.gr> writes: > > psql -h localhost -U markulis > > psql: could not connect to server: Network is unreachable > > Is the server running on host "localhost" and accepting > > TCP/IP connections on port 5432? > > Hm. "Network is unreachable" means that you have got a networking > problem not a database problem. You'll probably find that simple > commands like "ping localhost" don't work either. The problem could > be a DNS issue --- what does "nslookup localhost" say? If it comes > back with something reasonable, then you've got a kernel > misconfiguration issue, which I don't think I can help you with. > > regards, tom lane Thanks a lot. You were actually right, the network was down. I just had to give the command : "sudo ifup lo". I just couldn't narrow my search until you made sure that postgre is ok, so thanks again