Electrum server discussion thread

[filchef]

Your server is not good configured when I connect to him hi don't show limit of users for all servers and when I change it with another hi disappear  from the list of servers.

Hmm, I wouldn't call that "not good configured" - the server just lost its connection to IRC. After restarting it everything is back to normal.
Anyway thank you for the hint!

Again lost connection to IRC so I didnt try to use low fee 0.00001/kb with your server but with another servers ho use bitcoind  0.9.1 I try to send without suggest are you chek it is working with your server because I try with  <mr_burdell> from #electrum IRC chanel to fix him server without suggest - I send to him 0.0003 btc with fee 0.00001 but in him log there is dust error.

[1714472188]

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[raindex]

Can anyone give me a hint on what might be going wrong with my server. Any time it catches up with the blockchain, it crashes. The exception error message suggests that bind() fails, however I can't see the reason for that happening, as all ports assigned in the configuration file are unused. Here is what I get in the log file:

Code:

[21/04/2014-12:37:56] Database version 3
[21/04/2014-12:37:56] Blockchain height 296956
[21/04/2014-12:37:56] UTXO tree root hash: 469a5e3385265bc67a0f9479cc26f012d31b6544728148faf594140411d964d3
[21/04/2014-12:37:56] Coins in database: 1267617386701994
[21/04/2014-12:37:56] catching up missing headers: 296934 296956
[21/04/2014-13:24:55] catch_up: block 297000 (4.029s 2814.156s) 36ce5c0b18d7b84140e4b87c8d0334046c267c024d1ef51fe34b43573a97d54f
[21/04/2014-14:04:53] Blockchain is up to date.
[21/04/2014-14:05:40] utxo not in database; postponing mempool update
[21/04/2014-14:05:40] Memory pool initialized.
[21/04/2014-14:05:40] TCP server started on port 50001
[21/04/2014-14:05:40] SSL server started on port 50002
[21/04/2014-14:05:40] Stopping Stratum
Exception in thread Thread-8:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/threading.py", line 811, in __bootstrap_inner
    self.run()
  File "/home/bitcoin/src/electrum/server/transports/stratum_tcp.py", line 168, in run
    sock.bind((self.host, self.port))
  File "/usr/lib64/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 99] Cannot assign requested address

Exception in thread Thread-7:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/threading.py", line 811, in __bootstrap_inner
    self.run()
  File "/home/bitcoin/src/electrum/server/transports/stratum_tcp.py", line 168, in run
    sock.bind((self.host, self.port))
  File "/usr/lib64/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 99] Cannot assign requested address

Exception in thread Thread-9:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/threading.py", line 811, in __bootstrap_inner
    self.run()
  File "/home/bitcoin/src/electrum/server/transports/stratum_http.py", line 375, in run
    self.server = StratumThreadedServer((self.host, self.port))
  File "/home/bitcoin/src/electrum/server/transports/stratum_http.py", line 294, in __init__
    SocketServer.TCPServer.__init__(self, addr, requestHandler, bind_and_activate)
  File "/usr/lib64/python2.7/SocketServer.py", line 419, in __init__
    self.server_bind()
  File "/usr/lib64/python2.7/SocketServer.py", line 430, in server_bind
    self.socket.bind(self.server_address)
  File "/usr/lib64/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 99] Cannot assign requested address

Exception in thread Thread-10:
Traceback (most recent call last):
  File "/usr/lib64/python2.7/threading.py", line 811, in __bootstrap_inner
    self.run()
  File "/home/bitcoin/src/electrum/server/transports/stratum_http.py", line 370, in run
    self.server = StratumThreadedServer((self.host, self.port), self.certfile, self.keyfile)
  File "/home/bitcoin/src/electrum/server/transports/stratum_http.py", line 327, in __init__
    SSLTCPServer.__init__(self, addr, certfile, keyfile, requestHandler, bind_and_activate)
  File "/home/bitcoin/src/electrum/server/transports/stratum_http.py", line 263, in __init__
    self.server_bind()
  File "/usr/lib64/python2.7/SocketServer.py", line 430, in server_bind
    self.socket.bind(self.server_address)
  File "/usr/lib64/python2.7/socket.py", line 224, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 99] Cannot assign requested address

[21/04/2014-14:05:50] Stopping timer
[21/04/2014-14:05:50] Closing database...
[21/04/2014-14:05:50] Database is closed
[21/04/2014-14:05:50] Electrum Server stopped

[raindex]

Got it. In the configuration file, host should resolve to the address of an interface where the server should listen for new connections. For public server it should probably be 0.0.0.0. The name used by clients and peers to connect to the server should be defined in report_host.

[s4]

Hi all,

I just got my electrum server up and running today. All seems to be operating fine, but I am receiving this mesage in the logs:

KICK E_f6ee30c3ff:wrong_hash

This looks to be something to do with the IRC server for finding peers. Is this something to be concerned about?

[raindex]

I'm having the same problem. Folks at IRC suggested to redownload the DB from foundry.

[ThomasV]

Electrum servers build and maintain a merkle hash tree of the set of UTXOs in the blockchain.
Your server will be kicked from IRC if it does not advertise the correct root hash.

[raindex]

Redownloading latest DB indeed fixed the problem.

Now I wonder what the following lines mean. Is this normal?

[24/04/2014-00:33:26] utxo not in database; postponing mempool update
[24/04/2014-00:33:37] utxo not in database; postponing mempool update

[s4]

Fixed it for me as well.

I was able to reproduce the problem by starting the server without setting an appropriate limit for maximum open files. After an exception was thrown for too many open files, correcting the maximum open files and restarting the server caused my server to be kicked from IRC.

[ThomasV]

Four Electrum servers need to be updated:

 E_SLUSH
 E_206I
 E_CryptoPusH
 E_mg

They are running with the old 0.8 protocol (not used by recent clients), and they often get rejected from the IRC channel due to excess flood (this bug has been corrected for a while).
Please upgrade!

[Martok88]

Hi everyone. I've got my server up and running, and I'm able to connect to it using a copy of Electrum running on the same machine. However I'm unable to connect to it from my windows PC on the same network. I've tried each of the protocols and double checked the config, everything looks fine as far as I can tell. Any help would be appreciated.

Edit: I tried using both the server's LAN IP and its hostname to connect.

Edit2: I read through some previous posts and fixed the probelm by setting host to 0.0.0.0 in electrum.conf

If I'm able to store either the blockchain or Electrum's leveldb on an SSD, but not both, which would be better?

[Pontius]

Third time in 2 or 3 months that the database of my server e2.pdmc.net broke ("wrong_hash"). Is this just me or are other operators experiencing this as well?
Anyway, I'll take my server offline for now and bring it back online once I find enough time to move it faster hardware (probably in August).

[it-zone]

Third time in 2 or 3 months that the database of my server e2.pdmc.net broke ("wrong_hash"). Is this just me or are other operators experiencing this as well?
Anyway, I'll take my server offline for now and bring it back online once I find enough time to move it faster hardware (probably in August).

I have the same, I moved to Samsung 840 SSD but database is still breaking sometimes, without a clear reason.

S.

[raindex]

Third time in 2 or 3 months that the database of my server e2.pdmc.net broke ("wrong_hash"). Is this just me or are other operators experiencing this as well?
Anyway, I'll take my server offline for now and bring it back online once I find enough time to move it faster hardware (probably in August).

I have the same, I moved to Samsung 840 SSD but database is still breaking sometimes, without a clear reason.

I never had this problem, while running the server on a very old and busy box.

Do both of you want to share particulars of your setup to see if there are any similarities?

[it-zone]

I have nothing extraordinary in the config to show

[grnbrg]

Third time in 2 or 3 months that the database of my server e2.pdmc.net broke ("wrong_hash"). Is this just me or are other operators experiencing this as well?
Anyway, I'll take my server offline for now and bring it back online once I find enough time to move it faster hardware (probably in August).

Do you have the open files limit set sufficiently high? 

Code:

ulimit -n

should show 16k or higher.



grnbrg.

[Pontius]

Do you have the open files limit set sufficiently high? 

Code:

ulimit -n

should show 16k or higher.

That shouldn't be the problem - nofile is set to 32k in the upstart script.

My setup:
Ubuntu 12.04 LTS (kernel 3.2.0) w/Python 2.7.3; latest Electrum server from git; leveldb 1.9.0; plyvel 0.8

[grnbrg]

Do you have the open files limit set sufficiently high? 

Code:

ulimit -n

should show 16k or higher.

That shouldn't be the problem - nofile is set to 32k in the upstart script.

My setup:
Ubuntu 12.04 LTS (kernel 3.2.0) w/Python 2.7.3; latest Electrum server from git; leveldb 1.9.0; plyvel 0.8

What does the ulimit command show for the userid running the server, though?  On most Linuxes, max open files is set to 1024, and this limit can not be raised by non-root users.

You probably need to add a line to /etc/security/limits.conf to give your server user a higher soft/hard limit. ie:

Code:

electrum    soft    nofile    16384
electrum    hard   nofile    16384

grnbrg.

[Pontius]

What does the ulimit command show for the userid running the server, though?  On most Linuxes, max open files is set to 1024, and this limit can not be raised by non-root users.

As said the 'ulimit' is not the problem:

Code:

$ ps -efa|grep server.py |grep -v grep
electrum 24942     1  0 06:59 ?        00:00:00 /usr/bin/python -u server.py

$ cat /proc/24942/limits
Limit                     Soft Limit           Hard Limit           Units
Max cpu time              unlimited            unlimited            seconds
Max file size             unlimited            unlimited            bytes
Max data size             unlimited            unlimited            bytes
Max stack size            8388608              unlimited            bytes
Max core file size        0                    unlimited            bytes
Max resident set          unlimited            unlimited            bytes
Max processes             15862                15862                processes
Max open files            32768                32768                files
Max locked memory         65536                65536                bytes
Max address space         unlimited            unlimited            bytes
Max file locks            unlimited            unlimited            locks
Max pending signals       15862                15862                signals
Max msgqueue size         819200               819200               bytes
Max nice priority         0                    0
Max realtime priority     0                    0
Max realtime timeout      unlimited            unlimited            us

[g0dcompl3x]

I don't know how to edit/create/activate any server on my Electrum. I use a Window and any expert could just put a link here where I can learn about it. I know what you're thinking, but it's effortless to help me out here. Thanks

[grnbrg]

I don't know how to edit/create/activate any server on my Electrum. I use a Window and any expert could just put a link here where I can learn about it. I know what you're thinking, but it's effortless to help me out here. Thanks

At the risk of being rude, https://github.com/spesmilo/electrum-server/blob/master/HOWTO.md

If this is not sufficient to get you going, you probably shouldn't be running an Electrum server.


grnbrg.