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How to solve the openstack through wget can not download the problem, many novices are not very clear about this, in order to help you solve this problem, the following editor will explain in detail for you, people with this need can come to learn, hope you can gain something.

Failed to download wget in openstack instance

Why can't you download from openstack via wget, for example

$wget-c http://xxxxx/cloudify-components_3.1.0-ga-b85_amd64.debConnecting to 10.67.190.221 purl 80... Connected.HTTP request sent, awaiting response... Read error (Connection timed out) in headers.Retrying.$ wget-O-'https: / / ceph.com/git/?p=ceph.git;a=blob_plain;f=keys/autobuild.asc'Connecting to ceph.com (ceph.com) | 208.113.241.137 |: 443... connected.HTTP request sent, awaiting response... 200 OKLength: unspecified [text/plain] Saving to: `STDOUT' [

This problem can be solved by changing MTU from the default 1500 to 1400.

$sudo ip link set mtu 1400 dev eth0 $sudo ip link show dev eth02: eth0: mtu 1400 qdisc pfifo_fast state UP qlen 1000link/ether fa:16:3e:85:ee:a5 brd ff:ff:ff:ff:ff:ff

This means that OpenStack DHCP's MTU should be revised to 1400.

If neutron uses DHCP agent, but dhcp-option-force=26,1400 is not set on OpenVSwitch and GRE, as shown on the host network card via tcpdump, 1500 of MTU per host needs to be segmented.

IP 10.111.1.2 > 10.111.1.1: ICMP 10.111.1.2 unreachable-need to frag (mtu 1445), length

When OpenVSwitch uses the TINC interface on GRE and sets the DF flag that TINC obeys, the network packet will not be segmented and cannot reach the host. The puppet neutron module may automatically add this option when GRE uses when OpenVSwitch

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