Chrony Configuration
To start go to https://chrony.tuxfamily.org/download.html and download the latest version of chrony.
Then edit the /etc/chrony/chrony.conf file to look like this:
# 3 sources per time servers.
pool ntp.ubuntu.com iburst maxsources 3
pool time.nist.gov iburst maxsources 3
pool us.pool.ntp.org iburst maxsources 3
​
keyfile /etc/chrony/chrony.keys
​
driftfile /var/lib/chrony/chrony.drift
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logdir /var/log/chrony
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maxupdateskew 10.0
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rtcsync
​
# Make steps in 100ms.
makestep 0.1 3
Then restart chrony:
systemctl start chrony
Next edit /etc/sysctl.conf to look like this:
fs.file-max = 10000000
fs.nr_open = 10000000
​
net.core.netdev_max_backlog = 100000
net.core.somaxconn = 100000
net.ipv4.icmp_echo_ignore_broadcasts = 1
net.ipv4.ip_local_port_range = 1024 65535
net.ipv4.ip_nonlocal_bind = 1
net.ipv4.tcp_fin_timeout = 10
net.ipv4.tcp_keepalive_time = 300
net.ipv4.tcp_max_orphans = 262144
net.ipv4.tcp_max_syn_backlog = 100000
net.ipv4.tcp_max_tw_buckets = 262144
net.ipv4.tcp_mem = 786432 1697152 1945728
net.ipv4.tcp_reordering = 3
net.ipv4.tcp_rmem = 4096 87380 16777216
net.ipv4.tcp_sack = 0
net.ipv4.tcp_syncookies = 1
net.ipv4.tcp_syn_retries = 5
net.ipv4.tcp_tw_reuse = 1
net.ipv4.tcp_wmem = 4096 16384 16777216
​
net.netfilter.nf_conntrack_max = 10485760
net.netfilter.nf_conntrack_tcp_timeout_fin_wait = 30
net.netfilter.nf_conntrack_tcp_timeout_time_wait = 15
​
vm.swappiness = 10
Afterwards, edit /etc/security/limits.conf to this:
root soft nofile 32768
<CHANGE TO THE USERNAME WHO RUNS JORMUNGANDR> soft nofile 32768
<CHANGE TO THE USERNAME WHO RUNS JORMUNGANDR> hard nofile 1048576
If your service starts with systemctl then edit /etc/systemd/system/.service to something along the lines of:
[Unit]
Description=Shelley Staking Pool
After=multi-user.target
​
[Service]
Type=simple
ExecStart=<YOUR_NODE_START_SCRIPT>
​
# 16K Or more
LimitNOFILE=16384
​
Restart=on-failure
RestartSec=5s
User=<CHANGE TO THE USER ID WHO RUNS JORMUNGANDR>
Group=users
​
[Install]
WantedBy=multi-user.target
And run:
systemctl daemon-reload && systemctl enable shelley && systemctl start shelley
Remove comment above LimitNOFILE
​
Finally, allow the bare minimum of firewall allowance with this:
ufw allow <YOUR_NODE_LISTENING_PORT: default: 3000>/tcp
ufw allow <WHERE YOUR SSH SRV IS LISTENING default:22>/tcp
This guide was heavily inspired by https://gist.github.com/ilap/54027fe9af0513c2701dc556221198b2​
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