kkumar-fk

#!/bin/bash

# Number of units of each cryptocurrency.
u_bc=0.73674311
u_eth=0.75795629
u_rip=251.065810

# Get prices of each from https://api.coingecko.com/api/v3/coins/list
bc=`curl "https://api.coingecko.com/api/v3/coins/markets?vs_currency=inr&ids=bitcoin" 2> /dev/null | jq . | grep current_price | awk '{print $NF}' | cut -d, -f1 &`
eth=`curl "https://api.coingecko.com/api/v3/coins/markets?vs_currency=inr&ids=ethereum"  2> /dev/null | jq . | grep current_price | awk '{print $NF}' | cut -d, -f1 &`

kkumar-fk

#!/bin/bash

bridge fdb del 52:54:00:00:12:53 dev ens36v0
bridge fdb del 52:54:00:00:12:53 dev vmtap01 master
virsh attach-device --config --live vm01 vf.xml
virsh domif-setlink vm01 vmtap01 down

kkumar-fk

#!/bin/bash

DOMAIN=vm-01
PF=ens6np0
VF=ens6v1             # VF attached to the bridge.
VF_NUM=1
TAP_IF=vmtap01        # virtio-net interface in the VM.
VF_XML=vf.xml

MAC=52:54:00:00:12:53

kkumar-fk

  # cat vf.xml
  <interface type='hostdev' managed='yes'>
    <mac address='52:54:00:00:12:53'/>
    <source>
      <address type='pci' domain='0x0000' bus='0x42' slot='0x02' function='0x5'/>
    </source>
    <teaming type='transient' persistent='ua-backup0'/>
  </interface>

kkumar-fk

4: ens10: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc noqueue state UP group default qlen 1000
      link/ether 52:54:00:00:12:53 brd ff:ff:ff:ff:ff:ff
      inet 192.168.12.53/24 brd 192.168.12.255 scope global dynamic ens10
         valid_lft 42482sec preferred_lft 42482sec
      inet6 fe80::97d8:db2:8c10:b6d6/64 scope link
         valid_lft forever preferred_lft forever
5: ens10nsby: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master ens10 state DOWN group default qlen 1000
      link/ether 52:54:00:00:12:53 brd ff:ff:ff:ff:ff:ff
7: ens11: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc mq master ens10 state UP group default qlen 1000
      link/ether 52:54:00:00:12:53 brd ff:ff:ff:ff:ff:ff

kkumar-fk

  <interface type='network'>
    <mac address='52:54:00:00:12:53'/>
    <source network='enp66s0f0_br'/>
    <target dev='tap01'/>
    <model type='virtio'/>
    <driver name='vhost' queues='4'/>
    <link state='down'/>
    <teaming type='persistent'/>
    <alias name='ua-backup0'/>
  </interface>

kkumar-fk

entry:                   |  __x64_sys_sendto() {
entry:                   |    __sys_sendto() {
entry:                   |      sockfd_lookup_light() {
exit:         0.722 us   |      }
entry:                   |      sock_sendmsg() {
entry:                   |        security_socket_sendmsg() {
entry:                   |          apparmor_socket_sendmsg() {
exit:         0.763 us   |          }
exit:         1.069 us   |        }
entry:                   |        inet_sendmsg() {

kkumar-fk

1. Create a socket:
    server_fd = socket(...);
2. Bind to a well known IP address and port#:
    ret = bind(server_fd, ...);
3. Mark the socket as passive by changing it's state to LISTEN:
    ret = listen(server_fd, ...);
4. Wait for a client to connect, and get a reference file descriptor:
    client_fd = accept(server_fd, ...);

kkumar-fk

const struct linger opt = { .l_onoff = 1, .l_linger = 0 };

setsockopt(fd, SOL_SOCKET, SO_LINGER, &opt, sizeof opt);
close(fd);

kkumar-fk

srv_addr.sin_family        = AF_INET;
srv_addr.sin_addr.s_addr   = INADDR_ANY;
srv_addr.sin_port          = htons(SERVER_PORT);
bind(fd, &srv_addr, sizeof srv_addr);