StackOverflow2013

Note that there are some explanatory texts on larger screens.

plurals

POEC2, bottle.py connection
primarykey
Id
13760109
data
AcceptedAnswerId
13761955
AnswerCount
1
ClosedDate
CommentCount
4
CommunityOwnedDate
CreationDate
2012-12-07T09:19:51.370
FavoriteCount
1
LastActivityDate
2012-12-07T13:28:38.107
LastEditDate
2012-12-07T10:59:17.117
LastEditorUserId
1736294
OwnerUserId
1736294
ParentId
0
PostTypeId
1
Score
2
ViewCount
2666
LastEditorDisplayName
text
Body
Not able to launch a bottle.py server using an EC2 Ubuntu Linux 12.04 instance with a public IP address. The program (hw.py) is from the bottle tutorial ie. <pre><code>from bottle import route, run @route('/hello') def hello(): return 'hello world' run(host='xxx.xxx.xxx.xxx', port=80) </code></pre> Run as: <pre><code>> python hw.py or > sudo python hw.py </code></pre> generates the error: <pre><code>Traceback (most recent call last): File "hw.py", line 7, in <module> run(host='xxx.xxx.xxx.xxx', port=80) File "/usr/local/lib/python2.7/dist-packages/bottle.py", line 2700, in run server.run(app) File "/usr/local/lib/python2.7/dist-packages/bottle.py", line 2382, in run srv = make_server(self.host, self.port, handler, **self.options) File "/usr/lib/python2.7/wsgiref/simple_server.py", line 144, in make_server server = server_class((host, port), handler_class) File "/usr/lib/python2.7/SocketServer.py", line 408, in __init__ self.server_bind() File "/usr/lib/python2.7/wsgiref/simple_server.py", line 48, in server_bind HTTPServer.server_bind(self) File "/usr/lib/python2.7/BaseHTTPServer.py", line 108, in server_bind SocketServer.TCPServer.server_bind(self) File "/usr/lib/python2.7/SocketServer.py", line 419, in server_bind self.socket.bind(self.server_address) File "/usr/lib/python2.7/socket.py", line 224, in meth return getattr(self._sock,name)(*args) socket.error: [Errno 99] Cannot assign requested address </code></pre> The EC2 public IP address is not attached to any other process. Port 80 is not attached to another process. <pre><code>> sudo netstat -lp Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name tcp 0 0 *:ssh *:* LISTEN 629/sshd tcp6 0 0 [::]:ssh [::]:* LISTEN 629/sshd udp 0 0 *:bootpc *:* 463/dhclient3 Active UNIX domain sockets (only servers) Proto RefCnt Flags Type State I-Node PID/Program name Path unix 2 [ ACC ] STREAM LISTENING 7190 667/dbus-daemon /var/run/dbus/system_bus_socket unix 2 [ ACC ] STREAM LISTENING 5888 1/init @/com/ubuntu/upstart unix 2 [ ACC ] STREAM LISTENING 7312 741/acpid /var/run/acpid.socket unix 2 [ ACC ] SEQPACKET LISTENING 26855 21843/udevd /run/udev/control </code></pre> Changing to: run(host='xxx.xxx.xxx.xxx', port=8080) The error is socket.error: [Errno 99] Cannot assign requested address. Changing to: run(host='0.0.0.0', port=8080) ... which binds the server to all IPs/interfaces. Typing the EC2 public IP address into browser with and without :8080 displays a "This page is not available". Ideally, the first option ie. run(host='xxx.xxx.xxx.xxx', port=80) should work as that is how other web servers are kicked-off. Anyone have ideas how to solve this one? EDIT: added last set of lines from strace -f: <pre><code>write(2, " File \"/usr/lib/python2.7/Socke"..., 70 File "/usr/lib/python2.7/SocketServer.py", line 419, in server_bind ) = 70 open("/usr/lib/python2.7/SocketServer.py", O_RDONLY) = 4 fstat(4, {st_mode=S_IFREG|0644, st_size=23321, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f434cbfe000 read(4, "\"\"\"Generic socket server classes"..., 4096) = 4096 read(4, "service) is to maintain an\nexpli"..., 4096) = 4096 read(4, "set()\n\n def shutdown(self):\n "..., 4096) = 4096 read(4, "n't use serve_forever()\n - fi"..., 4096) = 4096 write(2, " ", 4 ) = 4 write(2, "self.socket.bind(self.server_add"..., 38self.socket.bind(self.server_address) ) = 38 close(4) = 0 munmap(0x7f434cbfe000, 4096) = 0 write(2, " File \"/usr/lib/python2.7/socke"..., 57 File "/usr/lib/python2.7/socket.py", line 224, in meth ) = 57 open("/usr/lib/python2.7/socket.py", O_RDONLY) = 4 fstat(4, {st_mode=S_IFREG|0644, st_size=20485, ...}) = 0 mmap(NULL, 4096, PROT_READ|PROT_WRITE, MAP_PRIVATE|MAP_ANONYMOUS, -1, 0) = 0x7f434cbfe000 read(4, "# Wrapper module for _socket, pr"..., 4096) = 4096 read(4, "oo long.\"\n errorTab[10064] = "..., 4096) = 4096 write(2, " ", 4 ) = 4 write(2, "return getattr(self._sock,name)("..., 39return getattr(self._sock,name)(*args) ) = 39 close(4) = 0 munmap(0x7f434cbfe000, 4096) = 0 write(2, "socket", 6socket) = 6 write(2, ".", 1.) = 1 write(2, "error", 5error) = 5 write(2, ": ", 2: ) = 2 write(2, "[Errno 99] Cannot assign request"..., 42[Errno 99] Cannot assign requested address) = 42 write(2, "\n", 1 ) = 1 rt_sigaction(SIGINT, {SIG_DFL, [], SA_RESTORER, 0x7f434c7d1cb0}, {0x41d920, [], SA_RESTORER, 0x7f434c7d1cb0}, 8) = 0 close(3) = 0 exit_group(1) = ? </code></pre>
Tags
<python><ubuntu><amazon-ec2><bottle>
Title
EC2, bottle.py connection
singulars
PostAcceptedAnswerId
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
PostParentId
1. This table or related slice is empty.
PostTypePostTypeId
1. PTQuestion
UserLastEditorUserId
1. USHenry Thornton
UserOwnerUserId
1. USHenry Thornton
plurals
PostLinksPostIdRelatedPostId
1. This table or related slice is empty.
PostLinksRelatedPostIdPostId
1. This table or related slice is empty.
PostsAcceptedAnswerId
1. This table or related slice is empty.
PostsParentIdCreationDate
1. PO
 singulars
 PostTypePostTypeId
 PTAnswer
VotesPostIdCreationDate
1. This table or related slice is empty.
CommentsPostId

Querying!

Guidance

A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.