DEV Community: Camille

Move docker volume to another disk

Camille — Tue, 22 Apr 2025 09:08:32 +0000

Docker volumes are essentially directories on the host filesystem, so moving them involves copying data and updating references.
Here’s a high-level guide to move a Docker volume to another disk:

1. Find the volume location

Docker stores volumes (by default) in:
/var/lib/docker/volumes/<volume_name>/_data

You can find the volume's mount point like this:

docker inspect <container_name>
docker volume inspect <volume_name>

Look for the Mountpoint field.

2. Stop the containers using the volume

This is important to avoid data corruption.

docker ps
docker stop <container_name>

3. Copy the volume data to the new disk

Let’s say you want to move it to /mnt/newdisk/docker-volumes/

sudo rsync -aP /var/lib/docker/volumes/<volume_name>/_data/ /mnt/newdisk/docker-volumes/<volume_name>/

Make sure /mnt/newdisk is mounted and accessible.

Bind-mount the new location Instead of using the Docker-managed volume, you can use a bind mount that points to the new location: When running the container, use:

docker run -v /mnt/newdisk/docker-volumes/<volume_name>:/data <image>

Or update your docker-compose.yml:

volumes:
  mydata:
    driver: local
    driver_opts:
      type: none
      device: /mnt/newdisk/docker-volumes/mydata
      o: bind

Then redeploy with:

docker-compose up -d

Optional: Remove the old volume
Only do this once you're 100% sure the move was successful:

docker volume rm <volume_name>

Let me know your setup (e.g., docker-compose, named volumes, etc.) if you want help crafting exact commands or config.

Gamma Hedging in the Crypto Market

Camille — Thu, 07 Mar 2024 01:48:48 +0000

The cryptocurrency market is widely known for its high volatility and
rapid price fluctuations, which can be both advantageous and challenging
for traders and investors. Given the dynamic nature of this market,
options trading has emerged as a popular strategy for managing risk and
speculating on price movements.

The Basics of Options Trading in Crypto

Options trading in the crypto market involves buying and selling options
contracts based on the price of digital assets such as Bitcoin (BTC) or
Ethereum (ETH). Options contracts give traders the right, but not the
obligation, to buy or sell the underlying cryptocurrency at a
predetermined price (strike price) within a specified time frame
(expiration date). There are two main types of options: calls, which
give the holder the right to buy the underlying asset, and puts, which
give the holder the right to sell the underlying asset.

Importance of Risk Management

Options trading in the crypto market can be highly lucrative. But, due
to the unique characteristics of the crypto market, it also carries
significant risks and presents notable challenges for its hedging, such
as:

High Volatility: The cryptocurrency market is renowned for its
dramatic price fluctuations, often exceeding the volatility observed
in traditional asset classes like stocks or bonds. It makes it
difficult to predict future price movements accurately, potentially
rendering traditional hedging strategies ineffective. Read more
about volatility in crypto
markets.
Delta Hedging Limitations: Delta hedging, a common hedging
strategy in options trading, involves continuously adjusting the
position to maintain a neutral delta. However, these adjustments may
need to be made frequently in the highly volatile crypto market. It
can be resource-intensive and lead to increased transaction costs.
Imperfect Markets: Traditional hedging strategies often rely on
the assumption of efficient markets where prices accurately reflect
all available information. However, the crypto market is still
relatively young and evolving, potentially exhibiting inefficiencies
that can impact the effectiveness of specific hedging strategies.

These challenges highlight the need for alternative hedging
approaches specifically tailored to address the unique complexities of
the crypto market. Gamma hedging emerges as a potentially more
suitable strategy for managing risk.

Understanding Gamma Hedging

Options traders use gamma hedging as a risk management strategy to
reduce their exposure to changes in the underlying asset\'s price and
volatility. It involves adjusting options positions to maintain a
delta-neutral or gamma-neutral portfolio, which helps to minimize the
impact of price movements on the overall value of the position.

In the crypto market, traders can use several strategies to implement
gamma hedging.

Dynamic Delta Hedging

Dynamic delta hedging is a strategy that involves continuously adjusting
options positions in response to changes in the underlying asset price.
Delta measures an option\'s price sensitivity to changes in the
underlying asset\'s price. By dynamically hedging delta, traders can
maintain a delta-neutral portfolio and reduce directional risk.

Vega Hedging

Vega hedging is a method traders use to adjust their options positions
in response to changes in vega. Vega measures an option\'s sensitivity
to changes in volatility, and by hedging it, traders can protect their
portfolios against volatility-level fluctuations. It reduces the impact
of volatility changes on the overall value of the position, helping
traders manage risk more effectively.

Gamma Scalping

Gamma scalping is a trading strategy that involves profiting from
changes in volatility through buying or selling options. Traders can
adjust their options positions in response to changes in the underlying
asset\'s price and volatility to capture profits from short-term price
movements. By scalping gamma, traders aim to take advantage of
fluctuations in volatility and generate profits from them.

Benefits of Gamma Hedging

Gamma hedging offers several benefits for options traders in the crypto
market:

Risk Management: Gamma hedging helps traders mitigate exposure
to changes in the underlying asset\'s price and volatility, reducing
the impact of market fluctuations on their portfolio.
Profit Potential: By effectively managing risk through gamma
hedging, traders can focus on maximizing profits and capitalizing on
opportunities in the crypto market.
Portfolio Stability: Maintaining a delta-neutral or
gamma-neutral portfolio through gamma hedging helps traders achieve
portfolio stability and balance, even in volatile market conditions.

Tips for Implementing Gamma Hedging Strategies

First of all, it\'s crucial to understand the practical implementation
and inherent limitations of gamma hedging:

Implementing Gamma Hedging:

Selling Options: The core principle of gamma hedging involves
selling options with a delta close to the desired constant delta of
the overall position. It can be achieved by selling options with a
delta slightly higher than the desired delta when the underlying
asset price rises and vice versa when it falls.
Dynamic Adjustments: As the underlying asset price fluctuates,
the delta of the existing options position will change. To maintain
the desired constant delta, dynamic adjustments may be needed by
buying or selling additional options to compensate for these
changes.

Considerations and Limitations:

Complexity: Implementing gamma hedging effectively requires a
deep understanding of options pricing, delta, gamma, and the
specific dynamics of the crypto market. It\'s not recommended for
beginner traders due to its inherent complexity and potential risks.
Transaction Costs: The frequent adjustments required in gamma
hedging can lead to significant transaction costs, which, if not
carefully managed, can erode potential profits.
Market Imperfections: Market inefficiencies in the crypto market
can impact the effectiveness of gamma hedging. These inefficiencies
can make it challenging to achieve and maintain a constant delta.
Risk Management: Even with gamma hedging, risk management
remains crucial. Unexpected market movements or unforeseen events
can still lead to losses, and it\'s essential to have stop-loss
orders and other risk mitigation strategies in place.

Effective implementation of gamma hedging strategies requires careful
planning and execution. Below are some practical tips for options
traders seeking to incorporate gamma hedging into their trading
strategies:

Understand Your Portfolio Exposure

Before implementing gamma hedging strategies, assessing your portfolio
exposure and identifying risk areas is essential. Understanding the
sensitivity of your options positions to changes in the underlying
asset\'s price and volatility will help you determine the appropriate
hedging strategy.

Monitor Market Conditions Closely

Gamma hedging requires active monitoring of market conditions, including
changes in the underlying asset\'s price, volatility levels, and options
prices. By staying informed about market developments, you can make
timely adjustments to your options positions and maintain a balanced
portfolio.

Use Risk Management Tools

Utilize risk management tools and software to analyze your options
positions, assess portfolio risk, and identify potential hedging
opportunities. Risk management tools can help you optimize your hedging
strategy and minimize losses in adverse market conditions.

Practice Discipline and Patience

Maintain discipline and patience when implementing gamma hedging
strategies. Avoid making impulsive decisions based on short-term market
fluctuations, and stick to your hedging plan. By staying disciplined and
patient, you can effectively manage risk and achieve long-term success
in options trading.

Gamma hedging is an advanced, helpful options trading strategy for
experienced traders in the cryptocurrency market. It can reduce risk
exposure and allow traders to capitalize on market movements. However,
to make it work effectively, it\'s essential to understand the
underlying concepts and implement responsible risk management practices.

It\'s important to note that gamma hedging is not a guaranteed path to
success, and significant risks remain even with this strategy.
Therefore, it\'s crucial to conduct thorough research and seek
professional guidance before attempting any advanced options trading
strategies, including gamma hedging, in cryptocurrency\'s volatile and
unpredictable world.

Yellow Capital specializes in strategic investments and prime crypto market making.

Channel push non blocking in GoLang

Camille — Wed, 11 Nov 2020 20:15:58 +0000

By default push operations to golang channel will block once the channel is full and wait that an other go routine will consume a message from the channel.

The following example will block after 3 messages queued in the channel, and since no other go routine is running it will crash with a dead lock error:

package main

import "fmt"

func main() {
    ch := make(chan string, 3)

    for i := 0; i < 10; i++ {
        ch <- "hello"
        fmt.Println("Pushed a message to the channel")
    }
}

To avoid blocking the execution of your application you can handle the case of a full channel by using select:

package main

import "fmt"

func main() {
    ch := make(chan string, 3)

    for i := 0; i < 10; i++ {
        select {
        case ch <- "hello":
            fmt.Println("Pushed a message to the channel")
        default:
            fmt.Println("WARN: The channel is full")
        }
    }
}

This way you can easily decide to ignore the message or handle this problem an other way than blocking the current go routine.

Open Finance

Camille — Tue, 10 Nov 2020 19:40:37 +0000

We started an initiative to make an open finance protocol for simplifying the connection of institutions (server to server) and the interoperability of bots (client to server).

Please share your thoughts: Open Finance

Github link: https://github.com/openware/open-finance-protocol

OpenDAX Crypto Exchange Software

Camille — Tue, 03 Nov 2020 15:35:43 +0000

OpenDAX stands for "Open-source Digital Asset Exchange".
It's a open-source platform providing a fully featured cryptocurrency exchange software, let's say a small binance software.

The OpenDAX repository contains a ready to use docker-compose structure to run the stack locally using docker, you can follow the readme to run everything in few minutes.

What are the main components of the stack

Barong

Barong is the authentication service of the stack.
It manages users profiles, 2FA using google authenticator and contains a builtin customizable KyC process. Users can upload their documents for operator to verify them or it can be connected to third party services to fully automate this process.

Peatio

Peatio is the core component of the exchange, it manages the accounting, the trading activities and the blockchains interaction. It supports natively Bitcoin, Litecoin, Ethereum (including all ERC20 tokens), Ripple and Dash but can be easily extended to support more blockchains and currencies. See the list of peatio wallets and blockchains plugins.

Rango

Rango is a high performance websocket server which dispatches public and private messages from other components (through message queues).

Rango makes the user experience smooth by forwarding public market informations in real time but also private updates for the connected user, trade notification for example.

Tower

Tower is the administration panel of the platform. It allows to manage users and KyC levels, monitor trading activity, deposited and withdrawn funds. It's free to use and can be extended by contacting the openware team.

React Interface

BaseApp is a React application containing all features of a regular crypto exchange platform, it can be used to quickly deliver a fully featured product on the market and thus be extended for the specific need of the project.

Storage and Databases

MySQL or PostgreSQL

SQL databases are used to store sensitive accounting informations and users profiles.

The stack is actively tested with the following database versions:

MySQL 5.7 and 8.0
PostgreSQL 13.0
MariaDB 10.3

InfluxDB

InfluxDB is an open source time series database, it is used to compute and store historical market chart data. OpenDAX components supports InfluxDB sharding and replication for scalability reason to support a platform to grow to hundreds of markets.

Business support

While OpenDAX is open-source and allows any Startup to adopt this technology with a very low entry cost, Openware provides support and licenses for scaling the solution as well as white label exchange deployed and managed in the Cloud.

You can read more about Openware cryptocurrency exchange software support and licenses. It includes a high performance trading engine written in go to reach high trading volume.